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Artykuły w czasopismach na temat „D-wave superconductor”

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Data publikacji: 6 września 2023

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1

LIAO, YAN-HUA, JIAN LI i FENG WANG. "INTERFACE SCATTERING EFFECT ON JOSEPHSON CURRENT IN A d-WAVE SUPERCONDUCTOR/d-WAVE SUPERCONDUCTOR JUNCTION". Modern Physics Letters B 25, nr 02 (20.01.2011): 131–40. http://dx.doi.org/10.1142/s0217984911025547.

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By taking into account the interface scattering effect in a d-wave superconductor (S)/insulator layer (I)/d-wave superconductor (S) junction, the temperature dependence of the critical current and the current-phase relation are studied theoretically. It is found that both the barrier scattering and the roughness scattering at the interface always suppress the Andreev reflection and the current-phase relation is almost sinusoidal in the junction. The Josephson current strongly depends on the crystalline axis orientation of the d-wave superconductor in the junction. Some different phenomena appear depending on whether the crystal orientations of the superconductors on the two sides are the same or not, and this is mainly presented in the influence of the zero-energy states formation at the interface on the critical current which changes with temperature and phase.

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2

Park, Mi-Ae, M. H. Lee i Yong-Jihn Kim. "Impurity Scattering in a d-Wave Superconductor". Modern Physics Letters B 11, nr 16n17 (20.07.1997): 719–26. http://dx.doi.org/10.1142/s0217984997000888.

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The influence of (non-magnetic and magnetic) impurities on the transition temperature of a d-wave superconductor is studied anew within the framework of BCS theory. Pairing interaction decreases linearly with the impurity concentration. Accordingly T c suppression is proportional to the (potential or exchange) scattering rate, 1/τ, due to impurities. The initial slope versus 1/τ is found to depend on the superconductor contrary to Abrikosov–Gor'kov type theory. Near the critical impurity concentration T c drops abruptly to zero. Because the potential scattering rate is generally much larger than the exchange scattering rate, magnetic impurities will also act as non-magnetic impurities as far as the T c decrease is concerned. The implication for the impurity doping effect in high T c superconductors is also discussed.

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3

Morita, Y., M. Kohmoto i K. Maki. "Aspects of a Single Vortex in d-Wave Superconductors". International Journal of Modern Physics B 12, nr 10 (20.04.1998): 989–1005. http://dx.doi.org/10.1142/s0217979298000557.

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Physical properties of a single vortex in d-wave superconductors are studied theoretically. After a brief review on a single vortex in "conventional" s-wave superconductors and the d-wave superconductivity underlying the hole-doped high-T c cuprates, we go on to study the quasiparticle spectrum around a single vortex in the high-T c superconductors. One of the characteristics of the high-T c superconductors is that they are close to the "quantum limit" (pFξ ~ O(1)). A new picture emerges of the quasiparticle spectrum. Instead of thousands of bound states in a "conventional" s-wave superconductor, we find only a few peaks in the local density of states at the vortex center. Further there are low-lying excitations stretched in four diagonal directions and they have no counterpart in s-wave superconductors.

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4

Cucolo, A. M., M. Cuoco i C. Noce. "d-Wave Tunnel Junctions". International Journal of Modern Physics B 13, nr 09n10 (20.04.1999): 1295–99. http://dx.doi.org/10.1142/s0217979299001338.

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We study the tunneling spectra for superconductor-insulator-normal metal (S-I-N) tunnel junctions with an s -wave or a d -wave superconductor within the weak-coupling model. We deduce the temperature behavior of tunneling conductance and their peak positions as well as of the zero-bias conductance. The results obtained allow us to discriminate among the two singlet spin states.

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5

Belyavsky, V. I., V. V. Kapaev i Yu V. Kopaev. "Topological d-wave superconductor". JETP Letters 96, nr 11 (luty 2013): 724–29. http://dx.doi.org/10.1134/s002136401223004x.

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6

Popović, Zorica, Ljiljana Dobrosavljević-Grujić i Radomir Zikic. "Quasiparticle Transport Properties of d-Wave Superconductor/Ferromagnet/d-Wave Superconductor Junctions". Journal of the Physical Society of Japan 82, nr 11 (15.11.2013): 114714. http://dx.doi.org/10.7566/jpsj.82.114714.

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7

Liao, Y. H., Z. C. Dong, Z. F. Yin i H. Fu. "Josephson current in ferromagnetic d-wave superconductor/ferromagnetic d-wave superconductor junction". Physics Letters A 372, nr 8 (luty 2008): 1327–32. http://dx.doi.org/10.1016/j.physleta.2007.09.031.

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8

Popović, Zorica, Predrag Miranović i Radomir Zikic. "Zero Bias Conductance in d-Wave Superconductor/Ferromagnet/d-Wave Superconductor Trilayers". physica status solidi (b) 255, nr 6 (6.02.2018): 1700554. http://dx.doi.org/10.1002/pssb.201700554.

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9

HAN, QIANG. "VORTEX STATE IN f-WAVE SUPERCONDUCTORS". Modern Physics Letters B 21, nr 17 (20.07.2007): 1051–56. http://dx.doi.org/10.1142/s0217984907013377.

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Motivated by the controversy concerning the pairing symmetry of the superconducting sodium-doped cobalt oxide, we investigate the microscopic electronic structure of an f-wave superconductor in the vortex state by diagonalizing an effective Hamiltonian specified in the triangular lattice self-consistently. We find that the low-lying vortex core states are in essence extended for the nodal f-wave superconductors. In comparison, we find localized bound states in the vortex core of the fully-gapped (d + id')-wave superconductors.

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10

Jin Xia, Dong Zheng-Chao, Liang Zhi-Peng i Zhong Chong-Gui. "Josephson effect in ferromagnetic d-wave superconductor/ferromagnet/ferromagnetic d-wave superconductor junctions". Acta Physica Sinica 62, nr 4 (2013): 047401. http://dx.doi.org/10.7498/aps.62.047401.

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11

Yan-Hua, Liao, Dong Zheng-Chao, Yin Zai-Feng i Fu Hao. "Zeeman effects on Josephson current in d-wave superconductor/d-wave superconductor junctions". Chinese Physics B 17, nr 5 (maj 2008): 1893–901. http://dx.doi.org/10.1088/1674-1056/17/5/058.

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12

Lin, Kai, Xiao-Mei Kuang, Wei-Liang Qian, Qiyuan Pan i A. B. Pavan. "Analysis of s-wave, p-wave and d-wave holographic superconductors in Hořava–Lifshitz gravity". Modern Physics Letters A 33, nr 26 (24.08.2018): 1850147. http://dx.doi.org/10.1142/s021773231850147x.

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In this work, the s-wave, p-wave and d-wave holographic superconductors in the Hořava–Lifshitz gravity are investigated in the probe limit. For this approach, it is shown that the equations of motion for different wave states in Einstein gravity can be written as a unified form, and condensates take place in all three cases. This scheme is then generalized to Hořava–Lifshitz gravity, and a unified equation for multiple holographic states is obtained. Furthermore, the properties of the condensation and the optical conductivity are studied numerically. It is found that, in the case of Hořava–Lifshitz gravity, it is always possible to find some particular parameters in the corresponding Einstein case where the condensation curves are identical. For fixed scalar field mass m, a nonvanishing [Formula: see text] makes the condensation easier than in Einstein gravity for s-wave superconductor. However, the p-wave and d-wave superconductors have T[Formula: see text] greater than the s-wave.

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13

LEE, C. Y. "dx2-y2-STATE OF HIGH TEMPERATURE SUPERCONDUCTORS WITH A SMALL ADMIXTURE OF dxy-STATE". Modern Physics Letters B 18, nr 12n13 (30.05.2004): 613–25. http://dx.doi.org/10.1142/s021798490400713x.

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It is well known that most of the high temperature superconductors (at least hole-type) are in d-wave state. But it is still an unsolved problem whether it is a pure d-wave state or one has some kind of mixed state. Among the candidates for an admixture, there are s- and d-wave states. Existing experiments could not resolve this issue. New possibilities for experimental resolution of this problem are opened via recent observation of the collective modes in UBe 13 (heavy fermion superconductor) by microwave impedance technique experiments and in Sr 2 RuO 4 (high temperature superconductor) by ultrasound attenuation experiments. Some theoretical treatments show that the most likely state is a mixture of two d-wave states: dx2-y2 and dxy with a small admixture of former state. To create the theoretical basis for investigation of possible mixed superconducting state in unconventional superconductors by sound attenuation and microwave absorption experiments, I derive for the first time a full set of equations for collective modes spectrum in dx2-y2-state with small admixture of dxy state. These equations allow to calculate the whole collective mode spectrum in mixed dx2-y2+iεdxy state and distinguish this state from pure d-wave states (whose collective mode spectrum has been calculated earlier) by ultrasound attenuation and microwave absorption experiments.

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14

Balents, Leon, Matthew P. A. Fisher i Chetan Nayak. "Nodal Liquid Theory of the Pseudo-Gap Phase of High-Tc Superconductors". International Journal of Modern Physics B 12, nr 10 (20.04.1998): 1033–68. http://dx.doi.org/10.1142/s0217979298000570.

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We introduce and study the nodal liquid, a novel zero-temperature quantum phase obtained by quantum-disordering a d-wave superconductor. It has numerous remarkable properties which lead us to suggest it as an explanation of the pseudo-gap state in underdoped high-temperature superconductors. In the absence of impurities, these include power-law magnetic order, a T-linear spin susceptibility, nontrivial thermal conductivity, and two- and one-particle charge gaps, the latter evidenced, e.g. in transport and electron photoemission (which exhibits pronounced fourfold anisotropy inherited from the d-wave quasiparticles). We use a (2+1)-dimensional duality transformation to derive an effective field theory for this phase. The theory is comprised of gapless neutral Dirac particles living at the former d-wave nodes, weakly coupled to the fluctuating gauge field of a dual Ginzburg–Landau theory. The nodal liquid interpolates naturally between the d-wave superconductor and the insulating antiferromagnet, and our effective field theory is powerful enough to permit a detailed analysis of a panoply of interesting phenomena, including charge ordering, antiferromagnetism, and d-wave superconductivity. We also discuss the zero-temperature quantum phase transitions which separate the nodal liquid from various ordered phases.

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15

Popović, Zorica, Radomir Zikic i Ljiljana Dobrosavljević-Grujić. "Orientation dependence of the Andreev transport in d-wave superconductor–ferromagnet–d-wave superconductor trilayers". Progress of Theoretical and Experimental Physics 2015, nr 10 (październik 2015): 103I01. http://dx.doi.org/10.1093/ptep/ptv133.

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16

Tanaka, Y., i S. Kashiwaya. "Theory of d.c. Josephson current in d-wave superconductor/normal metal/ d-wave superconductor junctions". Physica C: Superconductivity 282-287 (sierpień 1997): 1855–56. http://dx.doi.org/10.1016/s0921-4534(97)01087-3.

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17

Blackstead, Howard A., i John D. Dow. "OCCURRENCE OF SPIN-FLUCTUATION PAIRING IN HIGH-TEMPERATURE SUPERCONDUCTORS". International Journal of Modern Physics B 13, nr 29n31 (20.12.1999): 3635–41. http://dx.doi.org/10.1142/s0217979299003581.

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The definitive property of a spin-fluctuation d-wave-pairing superconductor is that cuprate-plane Cu-site Ni is a weaker Cooper-pair-breaker than Zn on the same site. None of the major high-temperature superconductors, except possibly YBa 2 Cu 3 O x, exhibits this property experimentally.

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18

Ohkubo, M., G. Uehara, J. Beyer, M. Mimura, H. Tanaka, K. Ehara, S. Tanaka i in. "Standard measurement method for normal state resistance and critical current of resistively shunted Josephson junctions". Superconductor Science and Technology 35, nr 4 (14.02.2022): 045002. http://dx.doi.org/10.1088/1361-6668/ac4f3b.

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Abstract An important parameter of Josephson junctions (JJs) is the product of normal state resistance (R n) and critical current (I c) for designing superconductor analogue devices or digital circuits. Determination of R n and I c from voltage–current (U–I) characteristic curves often faces difficulties; in particular I c is considerably reduced by intrinsic thermal or extrinsic electrical noises. Here, we propose a standard measurement method of R n and intrinsic critical current (I ci) for high-T c superconductor (HTS) grain boundary JJs operated in liquid nitrogen and low-T c superconductor (LTS) multilayer superconductor/normal-conductor/superconductor (SNS) JJs in liquid helium. The applicable condition of this method is that both HTS and LTS JJs have U–I curves compatible with resistively-shunted junction (RSJ) model. Both R n and I ci values are extracted by combining a geometric mean criterion to select a data set and a least-squares fitting method with the RSJ model, eliminating two distortion effects on U–I curves: noise-rounding and self-heating. The combined method ensures relative standard uncertainty values of 1.9% for R n and 8% for I ci or better, when the users follow the standard protocol. It is demonstrated that the combined method is valid for d-wave HTS JJs near 77 K, regardless of peculiarities such as 0–π junction transition in d-wave superconductors at lower temperatures, and s-wave LTS SNS JJs with a wide range of junction parameters. This work is the first step to facilitate standardization for superconductor electronics with JJs.

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19

Won, Hyekyung, i Kazumi Maki. "The antiparamagnon in D-wave superconductor". Physica C: Superconductivity 235-240 (grudzień 1994): 1689–90. http://dx.doi.org/10.1016/0921-4534(94)92066-4.

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20

Kim, Wonkee, i C. S. Ting. "Ginzburg–Landau Equations for a d-Wave Superconductor with Paramagnetic Impurities". International Journal of Modern Physics B 12, nr 10 (20.04.1998): 1069–95. http://dx.doi.org/10.1142/s0217979298000582.

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Ginzburg–Landau (GL) equations for a d-wave superconductor with a repulsive s-wave interaction between electrons in the presence of paramagnetic impurities are microscopically derived based on the Born approximation. The diagrammatic relationships for the impurity-averaged product of Green's functions are algebraically established. The effect of paramagnetic impurities on the transition temperature and the London penetration depth are discussed. GL equations for a superconductor with both s-wave and d-wave pairing interactions are also examined. We show that the transition temperature for a superconductor with an s-wave symmetry is suppressed twice as rapidly as that with a d-wave symmetry in the dilute impurity limit if the strength of the spin-non-flip scattering is much weaker than the spin-flip interaction.

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21

Guo, Hong, Fu-Wen Shu, Jing-He Chen, Hui Li i Ze Yu. "A holographic model of d-wave superconductor vortices with Lifshitz scaling". International Journal of Modern Physics D 25, nr 02 (luty 2016): 1650021. http://dx.doi.org/10.1142/s0218271816500218.

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We study analytically the [Formula: see text]-wave holographic superconductors with Lifshitz scaling in the presence of external magnetic field. The vortex lattice solutions of the model have also been obtained with different Lifshitz scaling. Our results imply that holographic [Formula: see text]-wave superconductor is indeed a type II one even for different Lifshitz scaling. This is the same as the conventional [Formula: see text]-wave superconductors in the Ginzburg–Landau (GL) theory. Our results also indicates that the dynamical exponent [Formula: see text] cannot affect the droplet solutions, and the vortex lattice solutions receive its effects only in the radial part. This naively implies that it does not have direct influence on the shape of vortex lattice even after the higher-order corrections are taken into consideration (away from the phase transition point [Formula: see text]). However, it has effects on the upper critical magnetic field [Formula: see text] through the fact that a larger [Formula: see text] results in a smaller [Formula: see text] and therefore influences the size (characterized by [Formula: see text]) of the vortex lattices. Furthermore, close comparisons between our results and those of the GL theory reveal the fact that the upper critical magnetic field [Formula: see text] is inversely proportional to the square of the superconducting coherence length [Formula: see text], regardless of the anisotropy between space and time.

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22

Xiao-Wei, Li, i Dong Zheng-Chao. "Josephson Current in Superconductor-Ferromagnet/Insulator/d-Wave Superconductor Junctions". Communications in Theoretical Physics 43, nr 3 (marzec 2005): 551–55. http://dx.doi.org/10.1088/0253-6102/43/3/035.

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23

Won, Hyekyung, i Kazumi Maki. "D-wave superconductor as a model of high Tc superconductor". Physica B: Condensed Matter 194-196 (luty 1994): 1459–60. http://dx.doi.org/10.1016/0921-4526(94)91229-7.

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24

Dong, Zhengchao. "Zeeman effects on d-wave superconductor and tunneling spectrum in normal-metal/d-wave superconductor tunnel junction". Science in China Series G: Physics, Mechanics and Astronomy 49, nr 5 (październik 2006): 597–605. http://dx.doi.org/10.1007/s11433-006-0597-y.

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25

Pang, Guiming, Michael Smidman, Jinglei Zhang, Lin Jiao, Zongfa Weng, Emilian M. Nica, Ye Chen i in. "Fully gapped d-wave superconductivity in CeCu2Si2". Proceedings of the National Academy of Sciences 115, nr 21 (8.05.2018): 5343–47. http://dx.doi.org/10.1073/pnas.1720291115.

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The nature of the pairing symmetry of the first heavy fermion superconductor CeCu2Si2 has recently become the subject of controversy. While CeCu2Si2 was generally believed to be a d-wave superconductor, recent low-temperature specific heat measurements showed evidence for fully gapped superconductivity, contrary to the nodal behavior inferred from earlier results. Here, we report London penetration depth measurements, which also reveal fully gapped behavior at very low temperatures. To explain these seemingly conflicting results, we propose a fully gapped d+d band-mixing pairing state for CeCu2Si2, which yields very good fits to both the superfluid density and specific heat, as well as accounting for a sign change of the superconducting order parameter, as previously concluded from inelastic neutron scattering results.

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26

Leroux, Maxime, Vivek Mishra, Jacob P. C. Ruff, Helmut Claus, Matthew P. Smylie, Christine Opagiste, Pierre Rodière i in. "Disorder raises the critical temperature of a cuprate superconductor". Proceedings of the National Academy of Sciences 116, nr 22 (13.05.2019): 10691–97. http://dx.doi.org/10.1073/pnas.1817134116.

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With the discovery of charge-density waves (CDWs) in most members of the cuprate high-temperature superconductors, the interplay between superconductivity and CDWs has become a key point in the debate on the origin of high-temperature superconductivity. Some experiments in cuprates point toward a CDW state competing with superconductivity, but others raise the possibility of a CDW-superconductivity intertwined order or more elusive pair-density waves (PDWs). Here, we have used proton irradiation to induce disorder in crystals of La1.875Ba0.125CuO4 and observed a striking 50% increase of Tc, accompanied by a suppression of the CDWs. This is in sharp contrast with the behavior expected of a d-wave superconductor, for which both magnetic and nonmagnetic defects should suppress Tc. Our results thus make an unambiguous case for the strong detrimental effect of the CDW on bulk superconductivity in La1.875Ba0.125CuO4. Using tunnel diode oscillator (TDO) measurements, we find indications for potential dynamic layer decoupling in a PDW phase. Our results establish irradiation-induced disorder as a particularly relevant tuning parameter for the many families of superconductors with coexisting density waves, which we demonstrate on superconductors such as the dichalcogenides and Lu5Ir4Si10.

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27

Caixeiro, E. S., E. V. L. de Mello i A. Troper. "Calculations for an inhomogeneous d-wave superconductor". Physica C: Superconductivity 459, nr 1-2 (sierpień 2007): 37–42. http://dx.doi.org/10.1016/j.physc.2007.04.219.

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28

Maki, Kazumi, Nils Schopohl i Hyekyung Won. "D-wave superconductor in high magnetic fields". Physica B: Condensed Matter 204, nr 1-4 (styczeń 1995): 214–21. http://dx.doi.org/10.1016/0921-4526(94)00266-x.

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29

Han, Jung Hoon. "Tunneling Spectra of Inhomogeneous d-Wave Superconductor". International Journal of Modern Physics B 17, nr 18n20 (10.08.2003): 3484–92. http://dx.doi.org/10.1142/s0217979203021253.

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The tunneling spectrum of an inhomogeneous d-wave superconductor is discussed in the framework of self-consistent slave-boson mean-field theory. Distinct from the usual BCS-type mean-field theory, an electron is now described using both fermionic and bosonic degree of freedom. We show that one can define two types of tunneling spectra in this theory, which also corresponds to two ways of calibrating the STM spectra. In good agreement with the experimental observation, we show that one type of tunneling spectrum remains inhomogeneous while the other type shows a remarkable degree of homogeneity at low energy, despite the underlying disorder. Physical implications of this result, in particular in relation to thermodynamic measurement such as heat capacity, are discussed.

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30

Millo, Oded, i Gad Koren. "What can Andreev bound states tell us about superconductors?" Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 376, nr 2125 (25.06.2018): 20140143. http://dx.doi.org/10.1098/rsta.2014.0143.

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Zero-energy Andreev bound states, which manifest themselves in the tunnelling spectra as zero-bias conductance peaks (ZBCPs), are abundant at interfaces between superconductors and other materials and on the nodal surface of high-temperature superconductors. In this review, we focus on the information such excitations can provide on the properties of superconductor systems. First, a general introduction to the physics of Andreev bound states in superconductor/normal metal interfaces is given with a particular emphasis on why they appear at zero energy in d -wave superconductors. Then, specific spectroscopic tunnelling studies of thin films, bilayers and junctions are described, focusing on the corresponding ZBCP features. Scanning tunnelling spectroscopy (STS) studies show that the ZBCPs on the c -axis YBa 2 Cu 3 O 7− δ (YBCO) films are correlated with the surface morphology and appear only in proximity to (110) facets. STS on c -axis La 1.88 Sr 0.12 CuO 4 (LSCO) films exhibiting the 1/8 anomaly shows spatially modulated peaks near zero bias associated with the anti-phase ordering of the d -wave order parameter predicted at this doping level. ZBCPs were also found in micrometre-size edge junctions of YBCO/SrRuO 3 /YBCO, where SrRuO 3 is ferromagnetic. Here, the results are consistent with a crossed Andreev reflection effect (CARE) at the narrow domain walls of the SrRuO 3 . ZBCPs measured in STS studies of manganite/cuprate bilayers could not be attributed to CARE because the manganite's domain wall is much larger than the coherence length in YBCO, and instead are attributed to proximity-induced triplet-pairing superconductivity with non-conventional symmetry. And finally, ZBCPs found in junctions of non-intentionally doped topological insulator films of Bi 2 Se 3 and the s -wave superconductor NbN are attributed to proximity-induced p x + i p y triplet order parameter in the topological material. This article is part of the theme issue ’Andreev bound states’.

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31

Verma, Sanjeev K., Anushri Gupta, Anita Kumari i B. D. Indu. "Superconducting gap anisotropy and d-wave pairing in YBa2Cu3O7−δ". International Journal of Modern Physics B 32, nr 04 (luty 2018): 1850035. http://dx.doi.org/10.1142/s0217979218500352.

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Considering Born–Mayer–Huggins potential as a most suitable potential to study the dynamical properties of high-temperature superconductors (HTS), the many-body quantum dynamics to obtain phonon Green’s functions has been developed via a Hamiltonian that incorporates the contributions of harmonic electron and phonon fields, phonon field anharmonicities, defects and electron–phonon interactions without considering BCS structure. This enables one to develop the quasiparticle renormalized frequency dispersion in the representative high-temperature cuprate superconductor YBa2Cu3O[Formula: see text]. The superconducting gap shows substantial changes with increased doping. The in-plane gap study revealed a [Formula: see text]-shape gap with a nodal point along [Formula: see text] direction for optimum doping ([Formula: see text] = 0.16) and the nodal point vanished in underdoped and overdoped regimes. The d[Formula: see text] pairing symmetry is observed at optimum doping with the presence of s or d[Formula: see text] components ([Formula: see text] 3%) in underdoped and overdoped regimes.

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32

SAMOKHIN, K. V., i B. MITROVIĆ. "CLASSICAL PHASE FLUCTUATIONS IN d-WAVE SUPERCONDUCTORS". Modern Physics Letters B 19, nr 21 (20.09.2005): 991–1009. http://dx.doi.org/10.1142/s0217984905009067.

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We study the effects of low-energy nodal quasiparticles on the classical phase fluctuations in a two-dimensional d-wave superconductor. The singularities of the phase-only action at T→0 are removed in the presence of disorder, which justifies using an extended classical XY-model to describe phase fluctuations at low temperatures.

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Ummarino, G. A., R. S. Gonnelli, C. Bravi i Masumi Inoue. "Pair Symmetry and Degree of Gap Depression at S-I Interfaces in HTS Josephson Junctions". International Journal of Modern Physics B 13, nr 09n10 (20.04.1999): 1301–6. http://dx.doi.org/10.1142/s021797929900134x.

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A new possible indirect way of testing pair symmetry in high-Tc superconductors has been set up. The degree of intrinsic gap depression at Superconductor-Insulator [S-I] interfaces required to match Ic(T)Rn(T) data in HTS Josephson junctions depends on the pair symmetry of the material itself, so that an higher fraction of d-wave symmetry for the order parameter requires less gap depression, while an higher fraction of s-wave corresponds to a larger degree of gap depression. In order to obtain a general reference value for the intrinsic amount of gap depression at S-I interfaces the de Gennes condition has been used, and resulting reduced Ic(T)Rn(T) data have been calculated in the framework of a mixed (s+id)-wave pair symmetry for the depressed order parameter ranging from pure s to pure d-wave. This model has been tentatively applied to two junctions' made of very different HTSs: YBCO and BKBO, yielding a result of almost pure d-wave for YBCO and of pure s-wave for BKBO.

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34

Sun, Ye, i Kazumi Maki. "Comparison between d-wave superconductor with nonmagnetic impurities and s-wave superconductor with magnetic impurities". Physica B: Condensed Matter 230-232 (luty 1997): 942–44. http://dx.doi.org/10.1016/s0921-4526(96)00699-0.

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Zhu, Jian-Xin, Z. D. Wang i H. X. Tang. "Bound states and Josephson current in mesoscopics-wave superconductor–normal-metal–d-wave superconductor junctions". Physical Review B 54, nr 10 (1.09.1996): 7354–59. http://dx.doi.org/10.1103/physrevb.54.7354.

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Lv, Bo, i Wei Guo. "The spin pairing symmetry of d-wave superconductor indicated by tunneling spectroscopy". International Journal of Modern Physics B 31, nr 25 (10.10.2017): 1745017. http://dx.doi.org/10.1142/s0217979217450175.

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Andreev reflection on the interface of ferromagnet/superconductor ([Formula: see text]) junction provides a tool for exhibiting the spin pairing symmetry in superconductors. The triplet tunneling in [Formula: see text]-wave [Formula: see text] junction observed in recent experiments revived a fundamental interest: the pairing mechanism of the superconducting cuprate. Here we show that in a doped cuprate, the effective spin coupling between the doped holes on the O sites yields a symmetric bound pair state [Formula: see text] with quantum numbers [Formula: see text], [Formula: see text] in the CuO2 layer, which explains the origin of the resonating valence bound state in cuprates, as well as the tunneling experiments. In addition, the [Formula: see text]-wave is consistent with the triplet pairing since the observable orbital wavefunction is a projection from the total odd-frequency wavefunction onto the quasi-2D superconducting CuO[Formula: see text] layer. High-temperature superconductivity as a long-standing puzzle touches upon a hiding symmetry: the triplet state ([Formula: see text], [Formula: see text]) is indistinguishable from the singlet ([Formula: see text]) either in NMR measurements, or in muon detections, but can be identified by tunneling spectroscopy of [Formula: see text] junction.

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Donini, Andrea, Víctor Enguita-Vileta, Fabian Esser i Veronica Sanz. "Generalising Holographic Superconductors". Advances in High Energy Physics 2022 (17.06.2022): 1–19. http://dx.doi.org/10.1155/2022/1785050.

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In this paper we propose a generalised holographic framework to describe superconductors. We first unify the description of s-, p-, and d-wave superconductors in a way that can be easily promoted to higher spin. Using a semianalytical procedure to compute the superconductor properties, we are able to further generalise the geometric description of the hologram beyond the AdS-Schwarzschild Black Hole paradigm and propose a set of higher-dimensional metrics which exhibit the same universal behaviour. We then apply this generalised description to study the properties of the condensate and the scaling of the critical temperature with the parameters of the higher-dimensional theory, which allows us to reproduce existing results in the literature and extend them to include a possible description of the newly observed f-wave superconducting systems.

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Sugiyama, T., i T. Ohmi. "Paramagnetically Limited Critical Field of d-Wave Superconductor". Progress of Theoretical Physics 89, nr 4 (1.04.1993): 787–91. http://dx.doi.org/10.1143/ptp/89.4.787.

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Chesca, B. "SQUID-Based Investigation of D-Wave Superconductor Junctions". Sensor Letters 7, nr 3 (1.06.2009): 263–65. http://dx.doi.org/10.1166/sl.2009.1039.

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Afsaneh, E., i H. Yavari. "Critical current of a granular d-wave superconductor". Solid State Communications 152, nr 21 (listopad 2012): 1933–38. http://dx.doi.org/10.1016/j.ssc.2012.07.007.

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Hajati, Y., S. Vosoughi nia i G. Rashedi. "Tunneling transport in d-wave superconductor-silicene junction". Superlattices and Microstructures 102 (luty 2017): 202–11. http://dx.doi.org/10.1016/j.spmi.2016.11.067.

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Won, Hyekyung, i Kazumi Maki. "Antiparamagnon and NMR in a d-wave superconductor". Physica B: Condensed Matter 206-207 (luty 1995): 664–66. http://dx.doi.org/10.1016/0921-4526(94)00550-f.

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Arberg, P., M. Mansor i J. P. Carbotte. "Penetration depth for a 2D D-wave superconductor". Solid State Communications 86, nr 10 (czerwiec 1993): 671–73. http://dx.doi.org/10.1016/0038-1098(93)90837-d.

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Jiang, C., i J. P. Carbotte. "Raman profile in superconductor with d-wave symmetry". Solid State Communications 95, nr 9 (wrzesień 1995): 643–45. http://dx.doi.org/10.1016/0038-1098(95)00047-x.

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Balatsky, A. V., Ar Abanov i Jian-Xin Zhu. "Inelastic tunneling spectroscopy in a d-wave superconductor". Physica C: Superconductivity 408-410 (sierpień 2004): 246–47. http://dx.doi.org/10.1016/j.physc.2004.02.134.

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Vali, R., i Mehran Vali. "Conductance properties of topological insulator based ferromagnetic insulator/d-wave superconductor and normal metal/ferromagnetic insulator/d-wave superconductor junctions". Journal of Applied Physics 112, nr 8 (15.10.2012): 083911. http://dx.doi.org/10.1063/1.4759250.

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Zagoskin, Alexandre M. "The half-periodic Josephson effect in an s-wave superconductor - normal-metal - d-wave superconductor junction". Journal of Physics: Condensed Matter 9, nr 31 (4.08.1997): L419—L426. http://dx.doi.org/10.1088/0953-8984/9/31/001.

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Dong, Z. C. "Zeeman effects on d-wave superconductor and the coherent tunneling spectrum in normal-metal/d-wave superconductor/normal-metal tunnel junctions". Solid State Communications 142, nr 10 (czerwiec 2007): 577–82. http://dx.doi.org/10.1016/j.ssc.2007.04.002.

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Zheng, Guo-Qing. "Extended Quasiparticle States Outside the Vortex Cores in a d-Wave Superconductor". International Journal of Modern Physics B 17, nr 18n20 (10.08.2003): 3509–12. http://dx.doi.org/10.1142/s0217979203021307.

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We a describe a measurement of the spin Knight shift (Ks) around the middle point between two vortices as a function of magnetic field (H) up to 28 T in a high-Tc superconductor TlSr 2 CaCu 2 O 6.8. At low temperatures, Ks increases substantially with increasing field, which indicates that the quasiparticle states with an ungapped spectrum are extended outside the vortex cores in a d-wave superconductor. The density of such states is found to be [Formula: see text], with N0 being the normal-state density of states and Hc2 being the upper critical field.

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Ong, Tzen, Piers Coleman i Jörg Schmalian. "Concealed d-wave pairs in the s± condensate of iron-based superconductors". Proceedings of the National Academy of Sciences 113, nr 20 (2.05.2016): 5486–91. http://dx.doi.org/10.1073/pnas.1523064113.

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A central question in iron-based superconductivity is the mechanism by which the paired electrons minimize their strong mutual Coulomb repulsion. In most unconventional superconductors, Coulomb repulsion is minimized through the formation of higher angular momentum Cooper pairs, with Fermi surface nodes in the pair wavefunction. The apparent absence of such nodes in the iron-based superconductors has led to a belief they form an s-wave (s±) singlet state, which changes sign between the electron and hole pockets. However, the multiorbital nature of these systems opens an alternative possibility. Here, we propose a new class of s± state containing a condensate of d-wave Cooper pairs, concealed by their entanglement with the iron orbitals. By combining the d-wave (L=2) motion of the pairs with the internal angular momenta I=2 of the iron orbitals to make a singlet (J=L+I=0), an s± superconductor with a nontrivial topology is formed. This scenario allows us to understand the development of octet nodes in potassium-doped Ba1−x KXFe2As2 as a reconfiguration of the orbital and internal angular momentum into a high spin (J=L+I=4) state; the reverse transition under pressure into a fully gapped state can then be interpreted as a return to the low-spin singlet. The formation of orbitally entangled pairs is predicted to give rise to a shift in the orbital content at the Fermi surface, which can be tested via laser-based angle-resolved photoemission spectroscopy.

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