Tunneling in anisotropic gap superconductors

被引：33

作者：

Bok, J ^{[1
]}

Bouvier, J ^{[1
]}

机构：

[1] ECOLE SUPER PHYS & CHIM IND VILLE PARIS,CNRS,UPR 5,LAB PHYS SOLIDE,F-75231 PARIS 05,FRANCE

来源：

PHYSICA C | 1997年 / 274卷 / 1-2期

关键词：

superconductivity; anisotropic gap; Van Hove singularities; tunneling spectroscopy;

D O I：

10.1016/S0921-4534(96)00642-9

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report a calculation of the density of states (DOS) of quasi-particle excitations in the superconducting state of high T-c cuprates using a model of the anisotropic gap that we have recently developed [1]. This model is based on the van Hove scenario, that is on the assumption that the Fermi level lies close to singularities in the DOS. We compare this theoretical DOS to the results obtained in various tunneling experiments especially with break junction [2,3] (S-I-S) and with vacuum scanning tunneling spectroscopy [4] (N-I-S). The agreement is very good. We explain the structure observed in the gap; and with the van Hove singularity slightly below the Fermi level we reproduce the observed asymmetry in the conductance and the dip in the DOS that is also seen in photoemission [5].

引用

页码：1 / 8

页数：8

共 18 条

[1]

ACHSAF NS, 1996, IN PRESS P MOS KARLS

[2] GAP ANISOTROPY AND VAN HOVE SINGULARITIES IN HIGH-T-C SUPERCONDUCTORS [J].

BOUVIER, J ;

BOK, J .

PHYSICA C, 1995, 249 (1-2) :117-122

[3] GAP ANISOTROPY IN BI2SR2CACU2O8+DELTA BY ULTRAHIGH-RESOLUTION ANGLE-RESOLVED PHOTOEMISSION [J].

DING, H ;

CAMPUZANO, JC ;

GOFRON, K ;

GU, C ;

LIU, R ;

VEAL, BW ;

JENNINGS, G .

PHYSICAL REVIEW B, 1994, 50 (02) :1333-1336

[4] ENERGY GAP IN SUPERCONDUCTORS MEASURED BY ELECTRON TUNNELING [J].

GIAEVER, I .

PHYSICAL REVIEW LETTERS, 1960, 5 (04) :147-148

[5]

HAAS N, 1992, J SUPERCOND, V5, P191

[6]

HASEGAWA T, 1992, PHYSICAL PROPERTIES, V3

[7] ELECTRONIC-SPECTRUM OF THE HIGH-TEMPERATURE SUPERCONDUCTING STATE [J].

HWU, Y ;

LOZZI, L ;

MARSI, M ;

LAROSA, S ;

WINOKUR, M ;

DAVIS, P ;

ONELLION, M ;

BERGER, H ;

GOZZO, F ;

LEVY, F ;

MARGARITONDO, G .

PHYSICAL REVIEW LETTERS, 1991, 67 (18) :2573-2576

[8] OBSERVATION OF A VANHOVE SINGULARITY IN BI2SR2CACU2O8+X WITH ANGLE-RESOLVED PHOTOEMISSION [J].

MA, J ;

QUITMANN, C ;

KELLEY, RJ ;

ALMERAS, P ;

BERGER, H ;

MARGARITONDO, G ;

ONELLION, M .

PHYSICAL REVIEW B, 1995, 51 (06) :3832-3839

[9] DIRECT VORTEX LATTICE IMAGING AND TUNNELING SPECTROSCOPY OF FLUX LINES ON YBA2CU3O7-DELTA [J].

MAGGIOAPRILE, I ;

RENNER, C ;

ERB, A ;

WALKER, E ;

FISCHER, O .

PHYSICAL REVIEW LETTERS, 1995, 75 (14) :2754-2757

[10] GAPLESS SUPERCONDUCTIVITY IN BI2SR2CACU2O8 [J].

MANDRUS, D ;

HARTGE, J ;

KENDZIORA, C ;

MIHALY, L ;

FORRO, L .

EUROPHYSICS LETTERS, 1993, 22 (03) :199-204

← 1 2 →