<i>d</i>-wave superconductor as a model of high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">T</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>superconductors

Won, Hyung Jin; Maki, Kazumi

doi:10.1103/physrevb.49.1397

Cited by 361 publications

(257 citation statements)

References 18 publications

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“…For the different symmetries of the order parameter a different behaviour of λ L (T ) has been predicted and experimentally found [65,66,67]. The presence of Andreev bound states at surfaces of HTS can have a significant effect on the low temperature dependence of the London penetration depth.…”

Section: Anomalous Meissner Currentmentioning

confidence: 97%

Andreev bound states in high temperature superconductors

et al. 1998

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Abstract. Andreev bound states at the surface of superconductors are expected for any pair potential showing a sign change in different k-directions with their spectral weight depending on the relative orientation of the surface and the pair potential. We report on the observation of Andreev bound states in high temperature superconductors (HTS) employing tunneling spectroscopy on bicrystal grain boundary Josephson junctions (GBJs). The tunneling spectra were studied as a function of temperature and applied magnetic field. The tunneling spectra of GBJ formed by YBa2Cu3O 7−δ (YBCO), Bi2Sr2CaCu2O 8+δ (BSCCO), and La1.85Sr0.15CuO4 (LSCO) show a pronounced zero bias conductance peak that can be interpreted in terms of Andreev bound states at zero energy that are expected at the surface of HTS having a d-wave symmetry of the order parameter. In contrast, for the most likely s-wave HTS Nd1.85Ce0.15CuO4−y (NCCO) no zero bias conductance peak was observed. Applying a magnetic field results in a shift of spectral weight from zero to finite energy. This shift is found to depend nonlinearly on the applied magnetic field. Further consequences of the Andreev bound states are discussed and experimental evidence for anomalous Meissner currents is presented.

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Section: Anomalous Meissner Currentmentioning

confidence: 97%

Andreev bound states in high temperature superconductors

et al. 1998

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“…the multigap model) in order to account for the nodal superconductor seen in Sr 2 RuO 4 through the specific heat [14] and the magnetic penetration depth [15]. Indeed all four states have the same quasiparticle density of states as d-wave superconductors [16]. As we shall see later, however, the multigap model is incompatible with the angle dependent magnetothermal conductivity observed by Izawa et al [5] and the universal heat conduction in κ zz observed by Suzuki et al [17] in Sr 2 RuO 4 .…”

Section: The Volovik Effectmentioning

confidence: 99%

“…In the absence of a magnetic field the quasiparticle density of states (DOS) of these four superconductors is given by [16] …”

Section: The Volovik Effectmentioning

confidence: 99%

Gap symmetry of superconducting borocarbide YNi2B2C and skutterudite PrOs4Sb12

et al. 2003

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Within the quasiclassical approximation we have studied the thermodynamics and the thermal conductivity in the vortex state in nodal superconductors (sc). Recent angle dependent magnetothermal conductivity results indicate a gap function ∆(k) corresponding to f-wave sc in Sr 2 RuO 4 and d-wave sc in CeCoIn 5 and κ-(ET)2Cu(NCS)2 respectively. More recently it is shown that ∆(k) in both YNi2B2C and PrOs4Sb12 have point nodes described by hybrid s+g wave gap function.

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“…The origin of this difference lies in the gap symmetry. In d-wave superconductors, the coherence peaks in the BCS DOS are weak logarithmic singularities 37 while in s-wave superconductors, they are strong square-root divergences. The strength of the scattering-rate peak at ⍀ sr + ⌬ 0 , and consequently the strength of the dip in the DOS and tunneling spectrum, are determined by the strength of the coherence peaks in the BCS DOS, as is clear from Eq.…”

Section: Resultsmentioning

confidence: 99%

Tunneling spectra of strongly coupled superconductors: Role of dimensionality

Berthod

2010

Phys. Rev. B

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We investigate numerically the signatures of collective modes in the tunneling spectra of superconductors. The larger strength of the signatures observed in the high-T c superconductors, as compared to classical low-T c materials, is explained by the low dimensionality of these layered compounds. We also show that the strongcoupling structures are dips ͑zeros in the d 2 I / dV 2 spectrum͒ in d-wave superconductors, rather than the steps ͑peaks in d 2 I / dV 2 ͒ observed in classical s-wave superconductors. Finally we question the usefulness of effective density of states models for the analysis of tunneling data in d-wave superconductors.

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d-wave superconductor as a model of high-Tcsuperconductors

Cited by 361 publications

References 18 publications

Andreev bound states in high temperature superconductors

Andreev bound states in high temperature superconductors

Gap symmetry of superconducting borocarbide YNi2B2C and skutterudite PrOs4Sb12

Tunneling spectra of strongly coupled superconductors: Role of dimensionality

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