TUNNELING SPECTROSCOPY AND PAIRING SYMMETRY OF THE HIGH-Tc SUPERCONDUCTORS

Kashiwaya, Satoshi; Tanaka, Yukio; Terada, Norio; Koyanagi, M.; Ueno, S.; Alff, Lambert; Takashima, Hiroshi; Tanuma, Y.; Kajimura, K.

doi:10.1016/s0022-3697(98)00174-7

Cited by 55 publications

(32 citation statements)

References 35 publications

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“…Actually, quasiclassical theory 11,26 shows that the induced subdominant pair potential breaks time-reversal symmetry. Recent tunneling experiments show that the ZBCP splits into two peaks even in the absence of an applied magnetic field, 20,27 which is consistent with the theory.…”

Section: Introductionsupporting

confidence: 82%

Quasiparticle states near surfaces ofhigh−Tcsuperconductors based on the extendedt−Jmodel

et al. 1999

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Quasiparticle properties near surfaces of d-wave superconductors are numerically studied based on the extended t-J model with Gutzwiller approximation. In order to simulate detailed profiles of the local density of states, the amplitudes of the transfer integrals are chosen so as to reproduce the Fermi surfaces of high-T c superconductors. It is shown that the spatial dependence of the local density of states is sensitive to the geometry of the surface, the shape of the Fermi surface, and the doping rate ␦. In particular, clear ␦ dependences are obtained in spectral features, i.e., zero-energy peaks and their splitting due to the inducement of an s-wave component which breaks time-reversal symmetry. The present results suggest that the microscopic parameters of actual materials can be extracted from a detailed analysis of scanning tunneling spectroscopy data. ͓S0163-1829͑99͒05337-0͔ PHYSICAL REVIEW B 1 OCTOBER 1999-I VOLUME 60, NUMBER 13 PRB 60 0163-1829/99/60͑13͒/9817͑10͒/$15.00 9817

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Section: Introductionsupporting

confidence: 82%

Quasiparticle states near surfaces ofhigh−Tcsuperconductors based on the extendedt−Jmodel

et al. 1999

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“…As is shown in Appendix A, it is found that there exists one to one correspondence between the solutions of the BdG equation (12) and those of (14). In particular, the zero energy state |u 0 (x ⊥ , k ) of (12) is exactly the same as the state |v 0 (x ⊥ , k ) of (14) with E 2 (k ) = 0.…”

Section: Statementioning

confidence: 76%

“…The ABS shows up as a zero bias conductance peak of tunneling spectroscopy [6][7][8]10 , and through the study of tunneling spectroscopy of high T c cuprates [11][12][13][14][15][16][17][18][19][20] , it has been established that a dispersionless zero energy ABS 7 is generated for d xy -wave superconductors. The existence of the ABS influences seriously interface and surface properties [21][22][23][24][25][26] .…”

Section: Introductionmentioning

confidence: 99%

Topology of Andreev bound states with flat dispersion

et al. 2011

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A theory of dispersionless Andreev bound states on surfaces of time-reversal invariant unconventional superconductors is presented. The generalized criterion for the dispersionless Andreev bound state is derived from the bulk-edge correspondence, and the chiral spin structure of the dispersionless Andreev bound states is argued from which the Andreev bound state is stabilized.Then we summarize the criterion in a form of index theorems. The index theorems are proved in a general framework to certify the bulk-edge correspondence. As concrete examples, we discuss (i) d xy -wave superconductor (ii) p x -wave superconductor, and (iii) noncentrosymmetric superconductors. In the last example, we find a peculiar time-reversal invariant Majorana fermion. The time-reversal invariant Majorana fermion shows an unusual response to the Zeeman magnetic field, which can be used to identify it experimentally.

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“…The experimental observations of the ZBCP splitting have been reported for normal metal / high-T c superconductor junctions 14,24,32,33 . It is a really interesting experiment to observe the same features by using ferromagnets/high-T c superconductor junctions in order to distinguish the spin-dependent effects from the BTRS states inducement.…”

Section: B Spin Filtering Effects and The Zbcp Splittingmentioning

confidence: 90%

Spin current in ferromagnet-insulator-superconductor junctions

Kashiwaya

Tanaka²,

Yoshida³

et al. 1999

Phys. Rev. B

261

234

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A theory of spin polarized tunneling spectroscopy based on a scattering theory is given for tunneling junctions between ferromagnets and d-wave superconductors. The spin filtering effect of an exchange field in the insulator is also treated. We clarify that the properties of the Andreev reflection are largely modified due to a presence of an exchange field in the ferromagnets, and consequently the Andreev reflected quasiparticle shows an evanescent-wave behavior depending on the injection angle of the quasiparticle. Conductance formulas for the spin current as well as the charge current are given as a function of the applied voltage and the spin-polarization in the ferromagnet for arbitrary barrier heights. It is shown that the surface bound states do not contribute to the spin current and that the zero-bias conductance peak expected for a d-wave superconductor splits into two peaks under the influence of the exchange interaction in the insulator.

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TUNNELING SPECTROSCOPY AND PAIRING SYMMETRY OF THE HIGH-Tc SUPERCONDUCTORS

Cited by 55 publications

References 35 publications

Quasiparticle states near surfaces ofhigh−Tcsuperconductors based on the extendedt−Jmodel

Quasiparticle states near surfaces ofhigh−Tcsuperconductors based on the extendedt−Jmodel

Topology of Andreev bound states with flat dispersion

Spin current in ferromagnet-insulator-superconductor junctions

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