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Articoli di riviste sul tema "Superconductivity"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 2 novembre 2024

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1

Kuibarov, Andrii, Oleksandr Suvorov, Riccardo Vocaturo, Alexander Fedorov, Rui Lou, Luise Merkwitz, Vladimir Voroshnin et al. "Evidence of superconducting Fermi arcs". Nature 626, n. 7998 (7 febbraio 2024): 294–99. http://dx.doi.org/10.1038/s41586-023-06977-7.

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AbstractAn essential ingredient for the production of Majorana fermions for use in quantum computing is topological superconductivity1,2. As bulk topological superconductors remain elusive, the most promising approaches exploit proximity-induced superconductivity3, making systems fragile and difficult to realize4–7. Due to their intrinsic topology8, Weyl semimetals are also potential candidates1,2, but have always been connected with bulk superconductivity, leaving the possibility of intrinsic superconductivity of their topological surface states, the Fermi arcs, practically without attention, even from the theory side. Here, by means of angle-resolved photoemission spectroscopy and ab initio calculations, we identify topological Fermi arcs on two opposing surfaces of the non-centrosymmetric Weyl material trigonal PtBi2 (ref. 9). We show these states become superconducting at temperatures around 10 K. Remarkably, the corresponding coherence peaks appear as the strongest and sharpest excitations ever detected by photoemission from solids. Our findings indicate that superconductivity in PtBi2 can occur exclusively at the surface, rendering it a possible platform to host Majorana modes in intrinsically topological superconductor–normal metal–superconductor Josephson junctions.

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2

LARBALESTIER, David C. "50 Years of Applied Superconductivity". TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) 50, n. 5 (2015): 214–17. http://dx.doi.org/10.2221/jcsj.50.214.

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3

Caplin, David. "Superconductivity and Hype-Superconductivity". Physics Bulletin 38, n. 12 (dicembre 1987): 450–51. http://dx.doi.org/10.1088/0031-9112/38/12/022.

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4

Di Benedetto, Francesco, Miria Borgheresi, Andrea Caneschi, Guillaume Chastanet, Curzio Cipriani, Dante Gatteschi, Giovanni Pratesi, Maurizio Romanelli e Roberta Sessoli. "First evidence of natural superconductivity: covellite". European Journal of Mineralogy 18, n. 3 (7 luglio 2006): 283–87. http://dx.doi.org/10.1127/0935-1221/2006/0018-0283.

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5

TANAKA, Shoji. "Superconductivity." Journal of the Japan Society for Precision Engineering 54, n. 1 (1988): 46–47. http://dx.doi.org/10.2493/jjspe.54.46.

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6

Cordelair, Jens. "Superconductivity". World Journal of Condensed Matter Physics 04, n. 04 (2014): 241–42. http://dx.doi.org/10.4236/wjcmp.2014.44026.

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7

Grosche, F. M. "Superconductivity". Science Progress 87, n. 1 (febbraio 2004): 51–78. http://dx.doi.org/10.3184/003685004783238571.

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8

Carson, C. Herbert, James A. Barrett e Mary Jean Colburn. "Superconductivity". Science & Technology Libraries 8, n. 4 (13 dicembre 1988): 63–75. http://dx.doi.org/10.1300/j122v08n04_09.

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9

Poole, C. P., H. A. Farach, R. J. Creswick e Anthony J. Leggett. "Superconductivity". Physics Today 49, n. 9 (settembre 1996): 90. http://dx.doi.org/10.1063/1.2807774.

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10

Schrieffer, J. R., e M. Tinkham. "Superconductivity". Reviews of Modern Physics 71, n. 2 (1 marzo 1999): S313—S317. http://dx.doi.org/10.1103/revmodphys.71.s313.

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11

Dahl, P. F. "Superconductivity". Physics Today 39, n. 11 (novembre 1986): 134. http://dx.doi.org/10.1063/1.2815230.

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12

Higuchi, Noboru. "Superconductivity". Journal of the Society of Mechanical Engineers 95, n. 887 (1992): 878–79. http://dx.doi.org/10.1299/jsmemag.95.887_878.

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13

Poole, Jr., Charles P., Horacio A. Farach, Richard J. Creswick e Kara Beauchamp. "Superconductivity". American Journal of Physics 65, n. 1 (gennaio 1997): 95. http://dx.doi.org/10.1119/1.18611.

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14

Bussmann-Holder, Annette. "Superconductivity". Materials Today 11, n. 12 (dicembre 2008): 70. http://dx.doi.org/10.1016/s1369-7021(08)70255-4.

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15

Caplin, A. D. "Superconductivity". Contemporary Physics 34, n. 3 (maggio 1993): 151–52. http://dx.doi.org/10.1080/00107519308213812.

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16

Hempstead, Colin A. "Superconductivity". Endeavour 17, n. 1 (marzo 1993): 48. http://dx.doi.org/10.1016/0160-9327(93)90050-d.

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17

Neumann, K. U. "Superconductivity". Endeavour 19, n. 1 (gennaio 1995): 45. http://dx.doi.org/10.1016/0160-9327(95)90003-9.

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18

Hirsch, J. E. "Hole superconductivity xOr hot hydride superconductivity". Journal of Applied Physics 130, n. 18 (14 novembre 2021): 181102. http://dx.doi.org/10.1063/5.0071158.

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19

NAGAO, HIDEMI, SERGEI P. KRUCHININ, ANATOLI M. YAREMKO e KIZASHI YAMAGUCHI. "MULTIBAND SUPERCONDUCTIVITY". International Journal of Modern Physics B 16, n. 23 (10 settembre 2002): 3419–28. http://dx.doi.org/10.1142/s0217979202012220.

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Multi-band superconductivity is investigated by using two-particle Green's function techniques, and equations for coupled states are derived in the framework of a two-band model. These results suggest that superconductivity appears, even if electron–electron interaction is positive. We also present a cooperative mechanism for multi-band superconductivity.

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20

Nagao, Hidemi, Hiroyuki Kawabe, Sergei P. Kruchinin, Dirk Manske e Kizashi Yamaguchi. "Theoretical Studies on Many-Band Effects in Superconductivity by Using Renormalization Group Approach". Modern Physics Letters B 17, n. 10n12 (20 maggio 2003): 423–31. http://dx.doi.org/10.1142/s0217984903005445.

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We present a renormalization equations for two-band superconductivity by using a two-band model and present phase diagrams for the two-band superconductivity. In the framework of two-band model, the present results predict that superconductivity appears, even if electron-electron interaction is positive. We discuss the possibility of a cooperative mechanism in the two-band superconductivity in relation to high-Tc superconductivity.

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21

Koblischka, Michael Rudolf, e Anjela Koblischka-Veneva. "Superconductivity 2022". Metals 12, n. 4 (28 marzo 2022): 568. http://dx.doi.org/10.3390/met12040568.

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Superconductivity in metals and alloys, i.e., conventional superconductivity, has seen many new developments in recent years, leading to a renewed interest in the principles of superconductivity and the search for new materials. The most striking discoveries include the near-room-temperature superconductivity in metal hydrides (LaH10) under pressure, the extreme stability of superconductivity in NbTi up to 261 GPa pressure, the discovery of high-entropy alloy (HEA) superconductor materials, and the machine learning prediction of new superconducting materials. Other interesting research concerns the properties of 2D superconductors, topological superconductors, e.g., in hybrid systems, and the use of nanotechnology to create nanowires and nanostructures with new properties. Furthermore, and most importantly, the drive from new accelerator and fusion reactors for stronger superconducting magnets has lead to improved cable materials, showing the highest critical current densities ever. Thus, this Special Issue aims to bring together a collection of papers reflecting the present activity in this field.

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22

Diamantini, Maria Cristina. "Superconductors with a Topological Gap". Condensed Matter 8, n. 2 (16 maggio 2023): 46. http://dx.doi.org/10.3390/condmat8020046.

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I review a new superconductivity mechanism in which the gap is opened through a topological mechanism and not through the Landau mechanism of spontaneous symmetry breaking. As a consequence, the low-energy effective theory which describes these new superconductors is not the Landau–Ginzburg theory, formulated in terms of a local-order parameter, but a topological-field theory formulated in terms of emerging gauge fields. This new mechanism is realized as global superconductivty in Josephson junction arrays and in thin superconducting films with thicknesses comparable to the superconducting coherence length, which exhibits emergent granularity.

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23

Wu, Wenqi. "Exploring Superconductivity: From Historical Milestones to Future Frontiers". Highlights in Science, Engineering and Technology 111 (19 agosto 2024): 174–79. http://dx.doi.org/10.54097/j1vphs61.

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Superconductivity has been a highly popular topic at the forefront of science since scientists firstly discovered this phenomenon. An enormous number of papers have been devoted to superconductivity during the past 100 years. New discoveries and research are constantly changing, driving people’s thinking about the essence of this phenomenon. Superconductivity has great prospects in many areas, it has many possible uses, including transporting, zero wasting electricity transmission, and quantum computer. This paper introduces histories of how scientists found superconductivity, definitions scientists made on superconductivity, mechanism that provides for this phenomenon, and some recent study on superconductivity. By introducing these findings and theorems, understanding of superconductivity will be simpler and clearer, making it more likely to trigger thinking and innovation on the unsolved problem in this region. Finally, a few predictions are made concerning the future usages and study of this topic. This work paves the way to unravel the microscopic mechanism of superconductivity.

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24

Oike, Hiroshi, Manabu Kamitani, Yoshinori Tokura e Fumitaka Kagawa. "Kinetic approach to superconductivity hidden behind a competing order". Science Advances 4, n. 10 (ottobre 2018): eaau3489. http://dx.doi.org/10.1126/sciadv.aau3489.

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Exploration for superconductivity is one of the research frontiers in condensed matter physics. In strongly correlated electron systems, the emergence of superconductivity is often inhibited by the formation of a thermodynamically more stable magnetic/charge order. Thus, to develop the superconductivity as the thermodynamically most stable state, the free-energy balance between the superconductivity and the competing order has been controlled mainly by changing thermodynamic parameters, such as the physical/chemical pressure and carrier density. However, such a thermodynamic approach may not be the only way to materialize the superconductivity. We present a new kinetic approach to avoiding the competing order and thereby inducing persistent superconductivity. In the transition-metal dichalcogenide IrTe2as an example, by using current pulse–based rapid cooling of up to ~107K s−1, we successfully kinetically avoid a first-order phase transition to a competing charge order and uncover metastable superconductivity hidden behind. Because the electronic states at low temperatures depend on the history of thermal quenching, electric pulse applications enable nonvolatile and reversible switching of the metastable superconductivity, a unique advantage of the kinetic approach. Thus, our findings provide a new approach to developing and manipulating superconductivity beyond the framework of thermodynamics.

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25

Slocombe, Daniel R., Vladimir L. Kuznetsov, Wojciech Grochala, Robert J. P. Williams e Peter P. Edwards. "Superconductivity in transition metals". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 373, n. 2037 (13 marzo 2015): 20140476. http://dx.doi.org/10.1098/rsta.2014.0476.

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A qualitative account of the occurrence and magnitude of superconductivity in the transition metals is presented, with a primary emphasis on elements of the first row. Correlations of the important parameters of the Bardeen–Cooper–Schrieffer theory of superconductivity are highlighted with respect to the number of d-shell electrons per atom of the transition elements. The relation between the systematics of superconductivity in the transition metals and the periodic table high-lights the importance of short-range or chemical bonding on the remarkable natural phenomenon of superconductivity in the chemical elements. A relationship between superconductivity and lattice instability appears naturally as a balance and competition between localized covalent bonding and so-called broken covalency, which favours d-electron delocalization and superconductivity. In this manner, the systematics of superconductivity and various other physical properties of the transition elements are related and unified.

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26

S. GuimarÃ£es, Eduardo. "The Beginning of The Nuclear Universe and The Theory of Orbital Superconductivity of The Celestial Bodies". JOURNAL OF ADVANCES IN PHYSICS 14, n. 2 (5 giugno 2018): 5442–48. http://dx.doi.org/10.24297/jap.v14i2.7406.

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This article is a logical and rational analysis of the original nuclear matter, and of the structure that gave rise to the space architecture of the universe with galaxies, stars, the system of planets and moons, and arrives to original and inedited conclusions. After the so-called Big Bang of the universe arose the space, a new time count and the nuclear universe, governed by the actions of the physical properties of nuclear superconductivity space. The actions of the physical properties of superconductivity nuclear matter generate the spatial phenomenon of orbital superconductivity, which creates the orbit and space distance of the orbit between the moons with their planets, between the planets with their star, forming the system of planets, and among the stars creating the architecture of the galaxy. 4 The actions of the physical properties of superconductivity nuclear matter also generate the spatial phenomenon of gravity superconductivity, which creates the form and distance of gravity in moons, planets, planets, stars and comets, creating the actions of physics of the star and planet with gravity superconductivity. The actions of the physical properties of superconductivity nuclear matter also generates the spatial phenomenon of nuclear superconductivity of magnetism, which creates the magnetic pole and the spatial distance of the magnetic field. The nucleus of all stars, planets, moons, are made of matter, called, by mass of energy nuclear of superconductivity. All the materials that exist in the nuclear universe are produced, through the atomic decomposition of nuclear matter of superconductivity. The atomic decomposition of superconductivity nuclear matter reduces the nucleus and nuclear energy of spatial superconductivity. In the reduction of superconductivity nuclear energy there is a loss of the orbital superconductivity property of the moon and the planet. In the loss of the orbital superconductivity property of the moon and the planet, the moon is attracted by the superconductivity of the planet and reduces orbit until attracted by the superconductivity of the planet's gravitational field. The fall of the moon will destroy the planet or produce a crater because of the size of the planet. The fall of the moon on Jupiter will create an immense nuclear crater in which the diameter and depth will measure the extension of thousands of kilometers. The fall of the moon on Mars will create an immense nuclear explosion, and will destroy the planet. Majority of the planets of the galaxies and the universe have a time schedule of self-destruction in the fall of the moons. Most of the planets in the solar system have a time schedule of self-destruction in the fall of the moons.

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27

Little, Reginald B. "Integrating Superconductivity in Cu Replace Lead Apatite by Nuclear Magnetic Moment Theory of RBL". European Journal of Applied Physics 6, n. 3 (23 maggio 2024): 7–13. http://dx.doi.org/10.24018/ejphysics.2024.6.3.275.

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Recently, scientists proclaimed superconductivity under ambient conditions of room temperature and 1 atmosphere pressure in Cu partial substituted lead apatite: Pb(10-x)Cux(PO4)6. This paper highlights the application of RBL’s stable isotope of positive and negative nuclear magnetic moments (NMMs) theory for explaining the heavy isotopic enrichment of this materials as {207Pb{10-x}63Cux(‘31PιO4)6}, where ι = 17 or 18 and the resulting superconductivity and novel room temperature atmospheric pressure superconductivity of this heavy isotopic enriched substance. On the basis of such analysis by RBL theory, the synthesis of high temperature, regular pressure superconductivity can be explained and this recent experimental observation of ambient pressure and temperature superconductivity in 207Pb{10-x}63Cux(‘31PιO4)6, where ι = 17 or 18, proves RBL’s NMMs theory of high temperature superconductivity. After 1 month on July 22, 2023 of the archiving of such data for superconductivity Pb(10-x)Cux(PO4)6 by Lee and coworkers, a huge experimental effort by hundreds of researchers around the world has attempted to replicate this room temperature, ambient pressure superconductivity in Pb(10-x)Cux(PO4)6 without success. The resulting inability to replicate the ambient superconductivity and note of some fractional component in the mixture causing the ambient superconductivity is explained by RBL’s theory as the fractional component may be clumped isotopes as in {207Pb{10-x}63Cux(‘31PιO4)6}, where ι = 17 or 18, and RBL here notes the vapor deposition process alleged by Lee and coworkers for producing the superconductivity was previously predicted by RBL to cause isotopic fractionation during solid to liquid and liquid to gas and gas to solid physical changes.

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28

Khlyustikov, I. N. "Surface Superconductivity of Vanadium". Journal of Experimental and Theoretical Physics 132, n. 3 (marzo 2021): 453–56. http://dx.doi.org/10.1134/s1063776121030043.

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Abstract The critical temperature of the surface superconductivity in vanadium (Tcs) is found to be 0.04 K higher than the critical temperature of its volume superconductivity (Tcv). Surface superconductivity persistent currents can effectively trap a magnetic flux. The critical current density of the surface superconductivity is estimated at js = 5 × 106 A/cm2 at T = Tcv.

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29

Li, Jun, e Dao-Xin Yao. "Superconductivity in octagraphene". Chinese Physics B 31, n. 1 (1 gennaio 2022): 017403. http://dx.doi.org/10.1088/1674-1056/ac40fa.

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Abstract This article reviews the basic theoretical aspects of octagraphene, an one-atom-thick allotrope of carbon, with unusual two-dimensional (2D) Fermi nesting, hoping to contribute to the new family of quantum materials. Octagraphene has an almost strongest sp2 hybrid bond similar to graphene, and has the similar electronic band structure as iron-based superconductors, which makes it possible to realize high-temperature superconductivity. We have compared various possible mechanisms of superconductivity, including the unconventional s± superconductivity driven by spin fluctuation and conventional superconductivity based on electron–phonon coupling. Theoretical studies have shown that octagraphene has relatively high structural stability. Although many 2D carbon materials with C4 carbon ring and C8 carbon ring structures have been reported, it is still challenging to realize the octagraphene with pure square-octagon structure experimentally. This material holds hope to realize new 2D high-temperature superconductivity.

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KRUCHININ, S. P., e H. NAGAO. "NANOSCALE SUPERCONDUCTIVITY". International Journal of Modern Physics B 26, n. 26 (11 settembre 2012): 1230013. http://dx.doi.org/10.1142/s0217979212300137.

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We deal with the problem of nanoscale superconductivity. Nanoscale superconductivity remains to be one of the most interesting research areas in condensed mater. Recent technology and experiments have fabricated high-quality superconducting MgB 2 nanoparticles. We consider the two-band superconductivity in ultrasmall grains, by extending the Richardson exact solution to two-band systems, and develop the theory of interactions between nano-scale ferromagnetic particles and superconductors. The properties of nano-sized two-gap superconductors and the Kondo effect in superconducting ultrasmall grains are investigated as well. The theory of the Josephson effect is presented, and his application to quantum computing are analyzed.

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31

LIU, FU-SUI, e WAN-FANG CHEN. "THEORY OF CHAIN SUPERCONDUCTIVITY IN YBa2Cu3O7-δ". International Journal of Modern Physics B 19, n. 04 (10 febbraio 2005): 783–90. http://dx.doi.org/10.1142/s0217979205027718.

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This paper extends the two-local-spin-mediated interaction (TLSMI) for the superconductivity in the CuO 2 plane of the high-Tc cuprates to the Cu - O chain superconductivity in YBa 2 Cu 3 O 7-δ (Y123), and sets up a theory for the chain superconductivity in Y123. We explain the observed 60 K chain superconductivity and predicts that the pseudogap should exist in the Cu - O chain of Y123.

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32

Xing, Ying, Zhibin Shao, Jun Ge, Jiawei Luo, Jinhua Wang, Zengwei Zhu, Jun Liu et al. "Surface superconductivity in the type II Weyl semimetal TaIrTe4". National Science Review 7, n. 3 (16 dicembre 2019): 579–87. http://dx.doi.org/10.1093/nsr/nwz204.

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Abstract The search for unconventional superconductivity in Weyl semimetal materials is currently an exciting pursuit, since such superconducting phases could potentially be topologically non-trivial and host exotic Majorana modes. The layered material TaIrTe4 is a newly predicted time-reversal invariant type II Weyl semimetal with the minimum number of Weyl points. Here, we report the discovery of surface superconductivity in Weyl semimetal TaIrTe4. Our scanning tunneling microscopy/spectroscopy (STM/STS) visualizes Fermi arc surface states of TaIrTe4 that are consistent with the previous angle-resolved photoemission spectroscopy results. By a systematic study based on STS at ultralow temperature, we observe uniform superconducting gaps on the sample surface. The superconductivity is further confirmed by electrical transport measurements at ultralow temperature, with an onset transition temperature (Tc) up to 1.54 K being observed. The normalized upper critical field h*(T/Tc) behavior and the stability of the superconductivity against the ferromagnet indicate that the discovered superconductivity is unconventional with the p-wave pairing. The systematic STS, and thickness- and angular-dependent transport measurements reveal that the detected superconductivity is quasi-1D and occurs in the surface states. The discovery of the surface superconductivity in TaIrTe4 provides a new novel platform to explore topological superconductivity and Majorana modes.

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GOR'KOV, L. P. "SURFACE AND SUPERCONDUCTIVITY". International Journal of Modern Physics B 20, n. 19 (30 luglio 2006): 2569–73. http://dx.doi.org/10.1142/s0217979206035035.

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Experiments reveal the existence of metallic bands at surfaces of metals and insulators. The bands can be doped externally. We review properties of surface superconductivity that may set up in such bands at low temperatures and various means of superconductivity defection. The fundamental difference as compared to the ordinary superconductivity in metals, besides its two-dimensionality lies in the absence of the center of space inversion. This results in mixing between the singlet and triplet channels of the Cooper pairing.

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Yanagisawa, Takashi. "Mechanism of High-Temperature Superconductivity in Correlated-Electron Systems". Condensed Matter 4, n. 2 (19 giugno 2019): 57. http://dx.doi.org/10.3390/condmat4020057.

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It is very important to elucidate the mechanism of superconductivity for achieving room temperature superconductivity. In the first half of this paper, we give a brief review on mechanisms of superconductivity in many-electron systems. We believe that high-temperature superconductivity may occur in a system with interaction of large-energy scale. Empirically, this is true for superconductors that have been found so far. In the second half of this paper, we discuss cuprate high-temperature superconductors. We argue that superconductivity of high temperature cuprates is induced by the strong on-site Coulomb interaction, that is, the origin of high-temperature superconductivity is the strong electron correlation. We show the results on the ground state of electronic models for high temperature cuprates on the basis of the optimization variational Monte Carlo method. A high-temperature superconducting phase will exist in the strongly correlated region.

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35

Anlage, Steven M. "Microwave Superconductivity". IEEE Journal of Microwaves 1, n. 1 (2021): 389–402. http://dx.doi.org/10.1109/jmw.2020.3033156.

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36

Berlincourt, T. G. "Superconductivity Centennial". MRS Bulletin 15, n. 6 (giugno 1990): 6–9. http://dx.doi.org/10.1557/s088376940005942x.

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Appleton, Bill R. "Superconductivity Applications". Science 246, n. 4931 (10 novembre 1989): 740. http://dx.doi.org/10.1126/science.246.4931.740.a.

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38

Abergel, David. "Double superconductivity". Nature Physics 17, n. 10 (ottobre 2021): 1073. http://dx.doi.org/10.1038/s41567-021-01387-w.

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Greene, Richard L. "Superconductivity Researchers". Science 271, n. 5252 (23 febbraio 1996): 1039. http://dx.doi.org/10.1126/science.271.5252.1039-a.

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POOL, R. "Copperless Superconductivity". Science 240, n. 4859 (17 giugno 1988): 1614. http://dx.doi.org/10.1126/science.240.4859.1614.

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Appleton, B. R. "Superconductivity Applications". Science 246, n. 4931 (10 novembre 1989): 740. http://dx.doi.org/10.1126/science.246.4931.740.

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V. Bondarev, Boris. "Gapless Superconductivity". International Journal of Physics 3, n. 2 (22 febbraio 2015): 88–95. http://dx.doi.org/10.12691/ijp-3-2-7.

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Hadlington, Simon. "UK superconductivity". Nature 327, n. 6120 (maggio 1987): 263. http://dx.doi.org/10.1038/327263d0.

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Porter, M. C. "Superconductivity/YBCO". IEEE Potentials 15, n. 2 (1996): 30–35. http://dx.doi.org/10.1109/45.489735.

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Reilly, J. J., M. Suenaga, J. R. Johnson, P. Thompson e A. R. Moodenbaugh. "Superconductivity inHxYBa2Cu3O7". Physical Review B 36, n. 10 (1 ottobre 1987): 5694–97. http://dx.doi.org/10.1103/physrevb.36.5694.

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46

Wiegmann, Paul. "Topological Superconductivity". Progress of Theoretical Physics Supplement 107 (1992): 243–79. http://dx.doi.org/10.1143/ptps.107.243.

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47

Ball, Philip. "Cosmic superconductivity". Nature Materials 19, n. 5 (24 aprile 2020): 490. http://dx.doi.org/10.1038/s41563-020-0671-2.

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Stewart, Sharon D. "Computing superconductivity". SIMULATION 47, n. 5 (novembre 1986): 219–20. http://dx.doi.org/10.1177/003754978604700508.

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