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Journal articles on the topic 'Copper oxide superconductors'

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Published: 4 June 2021

Last updated: 1 August 2024

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1

Tang, Shaoqiang, Hogliang Pan, and Zhao Xu. "Progress in the research of copper-oxide superconductors." Transportation Systems and Technology 4, no. 3 suppl. 1 (November 19, 2018): 203–11. http://dx.doi.org/10.17816/transsyst201843s1203-211.

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Since H·Carvalin·Onnesse discovered the superconductivity of mercury in 1911, we have made progress in the research of the superconductor and the superconductor have evolved from single element, alloy to complex compounds with multiple elements.With the development of the research about new superconducting materials, the research of iron based superconductors, copper-oxide superconductor and magnesium boride superconductor is the latest research trend. So far the proved highest superconducting transition temperature of copper-oxide superconductor is 130 K under normal pressure and could reach more than 160 K under high pressure. Based on the experience accumulated in past decades, we propose some general introduction about the main structure type, the superconducting principle and the application of copper-oxide superconductor.It is expected that a positive effect would be made in the research of copper-oxide superconductor. Background: Since H·Carvalin·Onnesse discovered the superconductivity of mercury in 1911, we have made progress in the research of the superconductor and the superconductor have evolved from single element, alloy to complex compounds with multiple elements. Aim: The purpose of this paper is to explain the differences between copper oxide superconductors and conventional superconductors and their superconducting mechanism. Methods: The superconducting mechanism and structure of copper oxide superconductors were analyzed by means of literature investigation, conceptual analysis and comparative study. Results: In this paper, the different structure forms of copper oxide are analyzed, and its superconducting mechanism is described in detail. The applications of several main copper oxide superconductors are introduced. Conclusion: Based on the experience accumulated in past decades, we propose some general introduction about the main structure type, the superconducting principle and the application of copper-oxide superconductor.It is expected that a positive effect would be made in the research of copper-oxide superconductor.

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2

CHEN, YU, XINMING HUANG, and JIANWU WANG. "FUNCTIONS OF OVERSTEP CHEMISTRY CALCULATION OXYGEN IN HIGH Tc COPPER OXIDE SUPERCONDUCTORS." Modern Physics Letters B 19, no. 22 (September 30, 2005): 1083–86. http://dx.doi.org/10.1142/s0217984905008980.

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This paper studies the functions of overstep chemistry calculation oxygen δ in high Tc copper oxide superconductors and analyzes the relative experiments' results. It is believed that the function of overstep chemistry calculation oxygen in Y series high Tc copper oxide superconductors is to adjust the change of effective electric charge P on the [Cu-O] p link or [Cu-O] P plane and this affects the bonding intensity on the CuO 2 plane, which in turn, adjusts the Y series high oxide superconductor's Tc.

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3

CHEN, YU, XINMIN HUANG, MING XING FU, and JIANWU WANG. "CHARACTERISTICS OF ISOTOPE EFFECT AND DOUBLE-BODY STRUCTURE MODEL." Modern Physics Letters B 19, no. 13n14 (June 20, 2005): 663–67. http://dx.doi.org/10.1142/s0217984905007998.

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The characteristics of the oxygen-isotope effect (16 O /18 O ) are studied with the double-body structure physical model in high-Tc copper oxide superconductors. With the double-body structure physical model, some reasonable explanations are given to the phenomena of high-Tc copper oxide superconductor's isotope effect, weak isotope effect, and abnormal isotope effect.

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4

Sleight, A. W., M. A. Subramanian, and C. C. Torardi. "High Tc Bismuth and Thallium Copper Oxide Superconductors." MRS Bulletin 14, no. 1 (January 1989): 45–48. http://dx.doi.org/10.1557/s0883769400053896.

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The first report of a superconductor in this family came from the laboratory of B. Raveau. The system was Bi/Sr/Cu/O. The Tc's were in the range 10-20 K, and this system therefore did not attract much attention when there was intense effort on 90 K superconductors. Neither the structure nor the composition of the superconductor in the Bi/Sr/Cu/O system was known at the time of the first publication, a common feature with all discoveries of new high Tc superconductors in the past couple of years. We now know that the first discovered member of this new family of superconductors can be represented as Bi2Sr2CuO6. However, the composition and structure of this phase are still not precisely established.Subsequent to the French work, the Bi/Sr/Ca/Cu/O system was studied in Germany, and higher Tc's were obtained. Although patents were filed; this work was not publicly announced. In January 1988, Maeda announced high Tc in the Bi/Sr/Ca/Cu/O system and Hermann announced high Tc in the Tl/Ba/Ca/Cu/O system.It is now known that there exists a very large family of compounds of the type (AO)mM2Can-1CunO2n+2. The A cation can be Tl, Pb, Bi or mixtures of these elements. The value of m may be one or two but is only two when A is Bi. The M cation is Ba or Sr, and substitution of Ca by Sr is frequently observed. The number of consecutively stacked CuO2 layers is indicated by n. The highest temperature at which zero resistivity has been obtained in this family is 122 K, and this has been obtained for several distinctly different compositions (Table I).

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5

Li, W. M., J. F. Zhao, L. P. Cao, Z. Hu, Q. Z. Huang, X. C. Wang, R. Z. Yu, et al. "The Unconventional Copper Oxide Superconductor with Conventional Constitution." Journal of Superconductivity and Novel Magnetism 33, no. 1 (November 30, 2019): 81–85. http://dx.doi.org/10.1007/s10948-019-05302-6.

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AbstractA new Ba2CuO4-y superconductor with critical temperature (Tc) exceeding 70 K was discovered. The X-ray absorption measurement gives evidence that this cuprate resembles La2CuO4 but is doped with a fairly large amount of holes, while in contrast to the so far known hole-doped high-Tc cuprates, the new cuprate possesses a much shorter local apical oxygen distance as well as much expanded in-plane Cu–O bond, leading to unprecedented compressed local octahedron. In compressed local octahedron, the Cu3d3z2–r2 orbital level will be lifted above the Cu3dx2-y2 orbital level with more three-dimensional features, implying that pairing symmetry may carry admixtures from more than one gap, suggesting that Ba2CuO4-y composed of alkaline earth copper oxides that are the essential elements to form cuprate superconductors may belong to a new branch of cuprate superconductors.

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6

UCHIDA, S. "PROPERTIES OF ELECTRON-DOPED SUPERCONDUCTORS." Modern Physics Letters B 04, no. 08 (April 20, 1990): 513–23. http://dx.doi.org/10.1142/s0217984990000659.

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In previously known high-T c copper oxide superconductors the charge carriers have been electron vacancies or holes. By contrast, we have recently discovered a class of superconducting copper oxides with the formula Ln 2−x Ce x CuO 4 in which the doped carriers are electrons. We described here how we created the new superconductors and discuss their physical properties.

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7

Lee, Dung-Hai. "Anyon Superconductivity and the Fractional Quantum-Hall Effect." International Journal of Modern Physics B 05, no. 10 (June 1991): 1695–713. http://dx.doi.org/10.1142/s0217979291001607.

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I review the concept of statistics transmutation in two dimensions and apply it to the understanding of Fractional quantum-Hall effect and anyon superconductivity. A contrast of the electromagnetic properties of an ordinary 2D superconductor, a quantum-Hall liquid and an anyon superconductor is presented. The relevance of the anyon model to copper-oxide superconductors is also discussed.

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8

Cava, R. J., and B. Batlogg. "Superconductivity at High Temperatures Without Copper: Ba1-xKxBiO3." MRS Bulletin 14, no. 1 (January 1989): 49–52. http://dx.doi.org/10.1557/s0883769400053902.

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Before the pioneering work of Bednorz and Müller in finding superconductivity near 30 K in lanthanum-barium-copper oxide,. oxide superconductors were well known, but perhaps not fully appreciated. Most anomalous among those superconductors was the perovskite structure material BaPb0.75Bi0.25O3, with a superconducting transition temperature (Tc) of 12 K2 and a surprisingly low density of states at the Fermi level. The increases in Tc for copper-oxide-based materials continue to generate worldwide excitement, but from both a chemical and theoretical point of view, high Tc superconductivity observed in a noncopper containing material is also of considerable interest.Recently we found that the simple cubic perovskite compound Ba0.6K0.4BiO3 displays a superconducting transition temperature near 30K—a Tc considerably higher than that of conventional superconductors and surpassed only by copper containing compounds. This material is in stark contrast to the now well-known copper oxides for two reasons: (1) superconductivity occurs within the framework of a three dimensionally connected bismuth-oxygen array (and not a 2-d array as in the Cu-O based compounds) and: (2) there are no magnetic fluctuations present in the chemical system, either in the superconductor itself or in the nonsuperconducting end member compound, eliminating the possibility that the high Tc might be caused by magnetic interactions. The parent compound BaBiO3 is, however, of considerable interest due to the presence of a structurally frozen charge disproportionation of the bismuth atoms, considered by many to be the electronic equivalent of the antiferromagnetism observed in the nonsuperconducting cuprate host compounds.The ideal undistorted perovskite ABO3 structure consists of a regular array of equally dimensioned BO6 octahedra sharing all corner oxygens with neighboring equivalent octahedra, with 180° B-O-B angles.

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9

Dumé, Isabelle. "Palladium oxides could make high-temperature superconductors." Physics World 36, no. 7 (July 1, 2023): 6i. http://dx.doi.org/10.1088/2058-7058/36/07/06.

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Researchers have found that palladates, oxide materials based on the element palladium, could be used to make superconductors that work at higher temperatures than cuprates (copper oxides) or nickelates (nickel oxides).

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10

Bench, Michael W., and C. Barry Carter. "Pulsed-laser deposition growth of copper oxide on α-Al2O3 and MgO." Proceedings, annual meeting, Electron Microscopy Society of America 52 (1994): 528–29. http://dx.doi.org/10.1017/s0424820100170372.

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Copper and its oxides are involved in many electronic materials applications. Cuprous oxide (Cu2O)is a semiconductor finding usage as a thin-film solar-cell material. The copper-oxide-based hightemperature superconductor materials have been extensively investigated. Also, the adhesion andbonding ofcopper to ceramic substrates is of interest for usage in electronic device packaging applications. For the case of alumina substrates, it has been demonstrated that the adhesion properties of thin copper wires is optimized for a ternary bonding environment at the interface. For the growth of oxidematerials, pulsed-laser ablation (PLA) is a viable means of growing films, and allows materials with a wide range of stoichiometrics to be produced. Indeed, this technique has found wide application inthe growth of high-temperature superconductors. In a previous study on PLA growth of CuO and Cu2O, Ogale etal. reported the growth of continuous epitactic Cu2O films on (100) MgO substrates at 700°C, whereas growth onto silicon and zirconia produced polycrystalline films.

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11

Fendorf, M., M. A. Rzeznik, and A. M. Stacy. "Superconductivity and observation of ordered structures in deintercalated LixNbO2." Proceedings, annual meeting, Electron Microscopy Society of America 53 (August 13, 1995): 376–77. http://dx.doi.org/10.1017/s0424820100138257.

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The prevalence of layered structures among the copper oxide superconductors has led us to search for new oxide superconductors with anisotropic structures to evaluate the relationship between structural anisotropy and superconductivity. Because of its layered structure, we identified the dichalcogenide LiNbO2 as a promising candidate for further study. The Nb oxidation state can be readily altered by deintercalation of Li, and we have reported magnetic measurements showing that the resulting LixNbO2 (x<l) is a superconductor with transition temperature Tc=5.5K. Interestingly it is the Meisner fraction rather than Tc, which changes as x is varied in this compound. This suggests that as a result of deintercalation, the material separates into two distinct phases, one superconducting and one non-superconducting, although powder x-ray diffraction shows no clear evidence of differences between LiNbO2 and deintercalated material. This type of behavior is often associated with the transition to the superconducting state as the composition is varied in transition metal oxides.

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12

Briant, C. L., J. A. DeLuca, P. L. Karas, M. F. Garbauskas, J. A. Sutliff, A. Goyal, and D. Kroeger. "The microstructural evolution of a silver-containing spray deposited 1223 Tl–Ca–Ba–Cu oxide superconductor." Journal of Materials Research 10, no. 4 (April 1995): 823–42. http://dx.doi.org/10.1557/jmr.1995.0823.

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This paper reports a study of the microstructural evolution of Ag-containing 1223 Tl-Ca-Ba-Cu oxide superconductors in spray-deposited films. The films were formed by spray depositing nitrates of Ca, Ba, Cu, and Ag onto a polycrystalline yttria-stabilized zirconia substrate. These deposits were then converted to a mixture of oxides (calcia, calcium-copper oxide, and barium cuprate) and metallic silver by heating in oxygen. When thallium oxide vapor was passed over the film, the thallium was incorporated into the film and the 1223 phase was formed. The evidence strongly suggests that the development of the 1223 superconductor involves the formation of a liquid phase. Our analysis suggests that the initial phase to form a liquid is CaO which contains thallium, barium, copper, and silver. Once this initial liquid is formed, it incorporates more thallium which, in turn, allows it to dissolve other types of oxides present in the film. In this way the liquid spreads across the surface. The equilibrium 1223 phase precipitates from it.

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13

Zhang, J. P., D. J. Li, C. Boldt, R. Plass, V. Dravid, L. D. Marks, C. H. Lin, et al. "Microstructure and properties of Cu-rich 123: Part II. Homogeneous copper and high magnetic Jc." Journal of Materials Research 8, no. 6 (June 1993): 1232–39. http://dx.doi.org/10.1557/jmr.1993.1232.

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Copper- and yttrium-rich YBa2Cu3O7 bulk superconductors have been prepared by mixing copper oxide or yttrium oxide in nitric acid and adding the solution to premade stoichiometric YBa2Cu3O7 followed by annealing. In contrast to materials made by mixing oxide powders, both samples contain copper-rich defects spread homogeneously throughout the grains, either small platelet copper oxide precipitates or bundles of planar defects (Cu–O double planes). These materials also show large magnetic hysteresis at 77 K, comparable to the results obtained from decomposed YBa2Cu4O8. This implies that small copper oxide precipitates and bundles of planar defects are strong flux pinners, and indicates a processing route to producing large amounts of strongly intragranular pinned superconductors. However, the materials also show clean grain boundaries, so an equally valid interpretation is that there is a substantial component of intergranular superconductivity in field, enhancing the effective circuit size to a value far larger than the grain size.

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14

Kokubun, Michio, and Jun Akimitsu. "Design of new copper oxide superconductors." Journal of the Japan Society of Powder and Powder Metallurgy 38, no. 2 (1991): 195–98. http://dx.doi.org/10.2497/jjspm.38.195.

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15

Loveday, J. S., R. J. Nelmes, M. I. Mmahon, D. R. Allan, E. Kaldis, J. Karpinski, B. Raveau, and V. Caignaert. "Structural studies of copper-oxide superconductors." Ferroelectrics 128, no. 1 (April 1992): 93–98. http://dx.doi.org/10.1080/00150199208015073.

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16

Chen, Xiao‐Dong, Sang Young Lee, John P. Golben, Sung‐Ik Lee, R. D. McMichael, Yi Song, Tae W. Noh, and J. R. Gaines. "Practical preparation of copper oxide superconductors." Review of Scientific Instruments 58, no. 9 (September 1987): 1565–71. http://dx.doi.org/10.1063/1.1139402.

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17

Antipov, E. V., S. N. Putilin, E. M. Kopnin, J. J. Capponi, C. Chaillout, S. M. Loureiro, M. Marezio, and A. Santoro. "Mercury-based copper mixed-oxide superconductors." Physica C: Superconductivity 235-240 (December 1994): 21–24. http://dx.doi.org/10.1016/0921-4534(94)91304-8.

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18

Tohyama, Takami, and Sadamichi Maekawa. "Physical Parameters in Copper Oxide Superconductors." Journal of the Physical Society of Japan 59, no. 5 (May 15, 1990): 1760–70. http://dx.doi.org/10.1143/jpsj.59.1760.

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19

Plakida, N. M. "Optical conductivity in copper oxide superconductors." Czechoslovak Journal of Physics 46, S2 (February 1996): 977–78. http://dx.doi.org/10.1007/bf02583796.

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20

MÉNDEZ-MORENO, R. M., M. MORENO, S. OROZCO, and M. A. ORTÍZ. "MINIMAL ANOMALOUS OCCUPANCY IN HIGH-Tc SUPERCONDUCTIVITY." Modern Physics Letters B 07, no. 24n25 (October 30, 1993): 1601–9. http://dx.doi.org/10.1142/s0217984993001624.

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A study of a minimal anomalous occupancy is carried out when a small gap occurs near the Fermi surface. A limit which tends softly to the normal occupancy can be introduced. This framework is applied to a quasi-bidimensional fermion gas which can mimick the copper oxide planes in cuprate superconductors. The energy scale implied by this minimally anomalous occupancy (the soft normal limit) for high-T c cuprate superconductors is of the order of the Debye energy. Yet this anomalous occupancy framework overcomes the phonon barrier and a good description for the critical temperature of a representative set of high-T c copper oxide superconductors is obtained.

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21

Chen, Honggang, Yongbo Li, Yao Qi, Mingzhong Wang, Hongyan Zou, and Xiaopeng Zhao. "Critical Current Density and Meissner Effect of Smart Meta-Superconductor MgB2 and Bi(Pb)SrCaCuO." Materials 15, no. 3 (January 27, 2022): 972. http://dx.doi.org/10.3390/ma15030972.

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The smart meta-superconductor MgB2 and Bi(Pb)SrCaCuO increase the superconducting transition temperature (TC), but the changes in the transport critical current density (JC) and Meissner effect are still unknown. Here, we investigated the JC and Meissner effect of smart meta-superconductor MgB2 and Bi(Pb)SrCaCuO. The use of the standard four-probe method shows that Y2O3:Eu3+ and Y2O3:Eu3++Ag inhomogeneous phase significantly increase the JC, and JC decreases to a minimum value at a higher temperature. The Meissner effect was measured by direct current magnetization. The doping of Y2O3:Eu3+ and Y2O3:Eu3++Ag luminescent inhomogeneous phase causes a Meissner effect of MgB2 and Bi(Pb)SrCaCuO at a higher temperature, while the non-luminescent dopant reduces the temperature at which samples have Meissner effect. The introduction of luminescent inhomogeneous phase in conventional MgB2 and copper oxide high-temperature Bi(Pb)SrCaCuO superconductor increases the TC and JC, and Meissner effect is exerted at higher temperature. Therefore, smart meta-superconductivity is suitable for conventional and copper oxide high-temperature superconductors.

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22

Maple, M. Brian. "High Tc Oxide Superconductors." MRS Bulletin 14, no. 1 (January 1989): 20–24. http://dx.doi.org/10.1557/s0883769400053859.

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The recent revolution in high temperature superconducting materials has generated a wave of intense excitement and activity that has swept through the scientific community, attracting the attention of the news media and general public as well. The reason for this is twofold: the unexpected occurrence of superconductivity at such high temperatures is of immense scientific interest, and the new high temperature oxide superconductors may have important technological applications.Based on a large amount of experimental information and (presumed!) theoretical understanding, the prevailing view prior to 1986, when high temperature superconductivity in oxides was discovered, was that the maximum value of the superconducting transition temperature Tc of any material would not increase much above ˜23 K, the high Tc record held since 1973 by the A15 compound Nb3Ge. In fact, between 1911 (the year H. Kammerlingh Onnes discovered superconductivity) and 1986, Tc only increased at an average rate of ˜0.25 K per year. However, within the last two years the maximum Tc value of the new copper oxide super-conductors has risen at an average rate of ˜50 K per year to its present value of ˜125 K! Thus, superconductivity near or above room temperature no longer seems out of the question, as it did a few short years ago! Moreover, the oxides were generally regarded as the least likely candidates for high Tc superconductivity due to their low concentrations of charge carriers. An understanding of the origin and nature of high Tc superconductivity in the new oxide compounds constitutes one of the most important and challenging scientific problems that has emerged in recent years.

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23

Paranthaman, M. Parans, and Teruo Izumi. "High-Performance YBCO-Coated Superconductor Wires." MRS Bulletin 29, no. 8 (August 2004): 533–41. http://dx.doi.org/10.1557/mrs2004.159.

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AbstractThis issue of MRS Bulletin provides an overview of the current status of research and development in the area of high-temperature superconductor (HTS) wires. High-temperature oxide superconductors, discovered in the late 1980s, are moving into the second generation of their development.The first generation relied on bismuth strontium calcium copper oxide, and the second generation is based on yttrium barium copper oxide, which has the potential to be less expensive and to perform better.The potential uses of HTS wires for electric power applications include underground transmission cables, oil-free transformers, superconducting magnetic-energy storage units, fault-current limiters, high-efficiency motors, and compact generators.Wires of 10–100 m in length can now be made, but material and processing issues must be solved before an optimized production scheme can be achieved.This issue covers a range of processing techniques using energetic beams, rolling, and laser and chemical methods to form wires with good superconducting properties.

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24

Kothari, N. C. "Powder Metallurgy and Ceramic Copper Oxide Superconductors." Solid State Phenomena 8-9 (January 1991): 509–36. http://dx.doi.org/10.4028/www.scientific.net/ssp.8-9.509.

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25

Zhou, Ji‐Ping, David R. Riley, A. Manthiram, Mark Arendt, Michael Schmerling, and John T. McDevitt. "Environmental reactivity characteristics of copper‐oxide superconductors." Applied Physics Letters 63, no. 4 (July 26, 1993): 548–50. http://dx.doi.org/10.1063/1.110000.

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26

Mahan, Gerald D. "Anisotropic energy gaps in copper oxide superconductors." Physical Review B 40, no. 16 (December 1, 1989): 11317–19. http://dx.doi.org/10.1103/physrevb.40.11317.

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27

Xiang, T., and J. M. Wheatley. "cAxis Superfluid Response of Copper Oxide Superconductors." Physical Review Letters 77, no. 22 (November 25, 1996): 4632–35. http://dx.doi.org/10.1103/physrevlett.77.4632.

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28

Mott, Nevill. "Spin polarons and the copper oxide superconductors." Philosophical Magazine B 65, no. 4 (April 1992): 767–73. http://dx.doi.org/10.1080/13642819208204916.

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29

Goodenough, J. B., J. S. Zhou, and J. Chan. "Copper oxide superconductors: A distinguishable thermodynamic state." Physical Review B 47, no. 9 (March 1, 1993): 5275–86. http://dx.doi.org/10.1103/physrevb.47.5275.

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30

Kamimura, Hiroshi, Hideki Ushio, and Shunichi Matsuno. "Theory of lanthanum copper oxide (LSCO) superconductors." Physica C: Superconductivity 460-462 (September 2007): 991–92. http://dx.doi.org/10.1016/j.physc.2007.03.317.

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31

Sharma, A. C., Nagendra Chaturvedi, and Y. M. Gupta. "Effective interaction potential for copper oxide superconductors." Physica C: Superconductivity 209, no. 4 (May 1993): 507–12. http://dx.doi.org/10.1016/0921-4534(93)90567-a.

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32

Ferrari, M. J., Mark Johnson, F. C. Wellstood, J. J. Kingston, T. J. Shaw, and John Clarke. "Magnetic flux noise in copper oxide superconductors." Journal of Low Temperature Physics 94, no. 1-2 (January 1994): 15–61. http://dx.doi.org/10.1007/bf00755416.

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33

Phillips, Philip, Ting-Pong Choy, and Robert G. Leigh. "Mottness in high-temperature copper-oxide superconductors." Reports on Progress in Physics 72, no. 3 (February 13, 2009): 036501. http://dx.doi.org/10.1088/0034-4885/72/3/036501.

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34

Klemm, R. A. "Phenomenological model of the copper oxide superconductors." Physical Review B 41, no. 4 (February 1, 1990): 2073–97. http://dx.doi.org/10.1103/physrevb.41.2073.

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35

Manthiram, A., X. X. Tang, and J. B. Goodenough. "c-axis oxygen in copper oxide superconductors." Physical Review B 42, no. 1 (July 1, 1990): 138–49. http://dx.doi.org/10.1103/physrevb.42.138.

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36

Goodenough, J. B., and J. S. Zhou. "Vibronic dispersion in the copper oxide superconductors." Physical Review B 49, no. 6 (February 1, 1994): 4251–60. http://dx.doi.org/10.1103/physrevb.49.4251.

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37

Mott, Nevill. "Metal-Insulator Transition in Copper Oxide Superconductors." Journal of Solid State Chemistry 111, no. 1 (July 1994): 2–3. http://dx.doi.org/10.1006/jssc.1994.1190.

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38

Einzel, Dietrich, and Rudi Hackl. "Electronic Raman Scattering in Copper Oxide Superconductors." Journal of Raman Spectroscopy 27, no. 3-4 (March 1996): 307–19. http://dx.doi.org/10.1002/(sici)1097-4555(199603)27:3/4<307::aid-jrs966>3.0.co;2-j.

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39

Norman, Peter. "Structure of Four Families of Layered Copper-oxide High Tc Superconductors." Australian Journal of Physics 42, no. 5 (1989): 545. http://dx.doi.org/10.1071/ph890545.

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Four major families of copper�oxide based high Tc superconductors have been identified by the following research groups: Bednorz and Muller (1986), Cava et al. (1988), Hor et al. (1987), Maeda et al. (1988), Sheng and Herman (1988) and Wu et al. (1987). It is now well established that the superconductivity is associated with the layers of copper�oxide and that some of the remaining structural building blocks in each primitive cell act as electron acceptors which induce the holes in the copper�oxide layers necessary for superconductivity.

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40

Murr, L. E., M. Pradhan, U. Sudarsan, and C. S. Niou. "Electron microscopy of explosively fabricated copper oxide superconductors." Proceedings, annual meeting, Electron Microscopy Society of America 47 (August 6, 1989): 190–91. http://dx.doi.org/10.1017/s0424820100152926.

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Efforts to fabricate useful devices or fixtures from copper oxide superconductor powders, especially YBa2Cu3O7, have been somewhat critically dependent upon structural and microstructural information provided by electron microscopy (especially SEM and TEM). In our own research, which involves the fabrication of monolithic structures encapsulating copper oxide superconducting, powdered material within a metal matrix such as copper, powder morphology, size and size distribution (Fig. 1) as well as powder microstructure (Fig. 2a) have been of concern in optimizing reliable superconducting products. Residual microstructures, including grain boundaries (inter-particle interfaces), are also critical features which control or influence mechanical behavior as well as superconductivity (especially transport supercurrent).The fabrication process involves significant features of both explosive welding and explosive consolidation, and optimization requires optimizing the welding of the metal matrix and simultaneous consolidation of the superconducting powder. In a copper matrix, one important optimum seems to lie within a narrow region of explosive detonation velocity (VD) ranging from 1.8 to 2.2 km/s.

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Daha, Rania, Manel Bouloudenine, Katia Djenadi, Tarek Tahraoui, Stefano Bellucci, and Abdelaziz Rabehi. "Manufactured Yttrium Barium Copper Nano Oxide for Medicinal Applications." Journal of Engineering and Exact Sciences 9, no. 8 (September 28, 2023): 16379–01. http://dx.doi.org/10.18540/jcecvl9iss8pp16379-01e.

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In light of the considerable interest surrounding the antibacterial properties of nanometal oxides and high-temperature superconductors, this study focuses on the synthesis of YBa2Cu3O7 (YBCO) using the Sol-Gel method. The research delves into the experimental aspects of nanoparticle (NP) synthesis and aims to elucidate the antibacterial potential of YBCO NPs, a high-temperature superconductor, against four distinct bacteria. These bacteria were subjected to varying concentrations of YBCO NPs (0.01 mg/ml, 0.025 mg/ml, 0.05 mg/ml, and 0.1 mg/ml). Comprehensive characterization of the synthesized nanoparticles encompassed techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and thermogravimetric (TG) analysis. Remarkably, the Gram-positive strains, including Staphylococcus epidermidis and Methicillin-resistant Staphylococcus aureus (MRSA), exhibited pronounced susceptibility to the YBCO NPs, while Gram-negative strains displayed minimal response. Intriguingly, even at elevated concentrations of 0.01, 0.025, 0.05, and 0.1 mg/ml, these bacterial strains showcased resilient resistance. This research sheds light on the potential of YBCO NPs as an antibacterial agent against specific pathogens.

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Chen, Yu, Xin Min Huang, Jian Wu Wang, and Xiao Shan Zeng. "The Progress on Study of Isotope Effects in High T_C Copper Oxide Superconductors." Materials Science Forum 546-549 (May 2007): 1957–60. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.1957.

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Through the review of the correlation on the isotope effects research and superconductivity mechanism research as well as the progress on the study of the isotope effects in the high Tc copper oxide superconductors, we have found the fundamental factors that cause the different changes of the isotope effect value in different dope region in high Tc cupper oxide superconductors. We point the high-temperature superconductivity mechanism possible origin phonons mediation electrons.

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Herbirowo, Satrio, Hedy Putra Pratama, Akhmad Herman Yuwono, Nofrijon Sofyan, and Agung Imaduddin. "A Comparative Study of the Manufacturing of BPSCCO Superconducting Wire with TiO₂ Dopants." Key Engineering Materials 897 (August 17, 2021): 79–84. http://dx.doi.org/10.4028/www.scientific.net/kem.897.79.

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Bi-Pb-Sr-Ca-Cu-O (BPSCCO) superconductors are recognized as a projectable high-temperature superconductor for high-efficiency electrical applications. The addition of Ti enhances the formation of the Bi-2223 phase from the BPSCCO superconductor. The process of producing BPSCCO superconducting materials with TiO2 dopants is performed by the solid-state process and the production of wire rolling, consisting of bismuth (III) oxide powder (Bi2O3 = 99%), Strontium Carbonate powder (SrCO3 = 99%), Calcium Carbonate powder (CaCO3 = 99%), Copper Oxide powder (CuO2 = 99%), Lead Oxide powder (PbO2 = 98%) Bi: Pb: Sr: Ca: Cu ratio: 1.6: 0.4:2:2:3 doped by 1 %wt Titanium Oxide powder (TiO2 = 98.5%). The variables used in this study were the comparison of the sintering method at 860°C for 24 hours and 820 °C calcination for 20 hours, and 850°C sintering for 20 hours. The superconductor characterization was tested through the X-Ray Diffraction (XRD) test, Scanning Electron Microscopy (SEM), and Resistivity test. XRD test results showed the formation of Bi2Sr2CuO6 and Bi2Sr5Cu3O16 phase. SEM results showed an increase in grain size. The resistivity test results showed that all samples formed critical temperatures, 9.6 and 9.5K respectively.

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Cheng, Chang. "Study on superconductivity of strongly correlated electronic systems by high voltage method." Journal of Physics: Conference Series 2387, no. 1 (November 1, 2022): 012023. http://dx.doi.org/10.1088/1742-6596/2387/1/012023.

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Abstract The study of condensed matter system with strongly correlated electron characteristics shows that the strongly correlated electron leads the system to have macroscopic quantum characteristics, which has multiple degrees of freedom in practical application and strong coupling relationship between them, resulting in abundant and peculiar quantum phenomena in the system. Nowadays, the research on unconventional superconductors is more and more in-depth, which not only expands the topics and ideas of practical research, but also makes excellent achievements. Therefore, on the basis of understanding the strongly correlated electron system, this paper studies the deep analysis of Fermion superconductor, copper oxide superconductor and iron based superconductor by means of high pressure experiment, so as to provide effective information for better understanding the microscopic mechanism on the basis of mastering the relevant unconventional superconductor refined research methods.

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Singh, Udai R., Seth C. White, Stefan Schmaus, Vladimir Tsurkan, Alois Loidl, Joachim Deisenhofer, and Peter Wahl. "Evidence for orbital order and its relation to superconductivity in FeSe0.4Te0.6." Science Advances 1, no. 9 (October 2015): e1500206. http://dx.doi.org/10.1126/sciadv.1500206.

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The emergence of nematic electronic states accompanied by a structural phase transition is a recurring theme in many correlated electron materials, including the high-temperature copper oxide– and iron-based superconductors. We provide evidence for nematic electronic states in the iron-chalcogenide superconductor FeSe0.4Te0.6 from quasi-particle scattering detected in spectroscopic maps. The symmetry-breaking states persist above Tc into the normal state. We interpret the scattering patterns by comparison with quasi-particle interference patterns obtained from a tight-binding model, accounting for orbital ordering. The relation to superconductivity and the influence on the coherence length are discussed.

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Kopp, A., A. Ghosal, and S. Chakravarty. "Competing ferromagnetism in high-temperature copper oxide superconductors." Proceedings of the National Academy of Sciences 104, no. 15 (April 2, 2007): 6123–27. http://dx.doi.org/10.1073/pnas.0701265104.

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Sharma, A. C. "Effective Potential and Superconductivity in Copper Oxide Superconductors." Physica Scripta 57, no. 1 (January 1, 1998): 156–60. http://dx.doi.org/10.1088/0031-8949/57/1/018.

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McMullen, T., P. Jena, S. N. Khanna, Yi Li, and Kjeld O. Jensen. "Positron trapping at defects in copper oxide superconductors." Physical Review B 43, no. 13 (May 1, 1991): 10422–30. http://dx.doi.org/10.1103/physrevb.43.10422.

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Kuroki, Kazuhiko, and Hideo Aoki. "Two-band hubbard model for copper oxide superconductors." Physica B: Condensed Matter 165-166 (August 1990): 1011–12. http://dx.doi.org/10.1016/s0921-4526(09)80091-4.

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Muroi, Michihito, and Robert Street. "Charge distribution in triple-layered copper oxide superconductors." Physica C: Superconductivity 248, no. 3-4 (June 1995): 290–310. http://dx.doi.org/10.1016/0921-4534(95)00226-x.

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