Theory of local density of states of dx(2)-y(2)-wave superconducting state near the surfaces of the t-J model

被引：60

作者：

Tanuma, Y ^{[1
]}

Tanaka, Y

Ogata, M

Kashiwaya, S

机构：

[1] Niigata Univ, Grad Sch Sci & Technol, Niigata 9502102, Japan

[2] Univ Tokyo, Grad Sch Arts & Sci, Dept Basic Sci, Meguro Ku, Tokyo 1530041, Japan

[3] Inst Mol Sci, Okazaki, Aichi 4440867, Japan

[4] Electrotech Lab, Tsukuba, Ibaraki 3050045, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1998年 / 67卷 / 04期

关键词：

t-J model; d-wave superconductor; Gutzwiller approximation; scanning tunneling spectroscopy; zero-energy peaks; spontaneous time-reversal symmetry breaking;

D O I：

10.1143/JPSJ.67.1118

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Spatial dependencies of the pair potential and the local density of states near the surfaces of d(x2-y2)-wave superconductors are studied theoretically. The calculation is based on the t-J model within a mean-field theory with Gutzwiller approximation. Various types of surface geometries are considered. Similar to our result in the extended Hubbard model, it is found that the formation of zero-energy states strongly depends on the surface geometry. In addition to this feature, the zero-energy states give peak splitting for the (110) surfaces when the super-exchange interaction J is large. This is due to the induced s-wave component near the surface. The present result explains the microscopic origin of the spontaneous time-reversal symmetry breaking at the surfaces of high-T-c superconductors.

引用

页码：1118 / 1121

页数：4

共 30 条

[1] Spatially continuous zero-bias conductance peak on (110) YBa2Cu3O7-delta surfaces [J].

Alff, L ;

Takashima, H ;

Kashiwaya, S ;

Terada, N ;

Ihara, H ;

Tanaka, Y ;

Koyanagi, M ;

Kajimura, K .

PHYSICAL REVIEW B, 1997, 55 (22) :14757-14760

[2] Quasiparticle bound states and low-temperature peaks of the conductance of NIS junctions in d-wave superconductors [J].

Barash, YS ;

Svidzinsky, AA ;

Burkhardt, H .

PHYSICAL REVIEW B, 1997, 55 (22) :15282-15294

[3] The effect of surfaces on the tunneling density of states of an anisotropically paired superconductor [J].

Buchholtz, LJ ;

Palumbo, M ;

Rainer, D ;

Sauls, JA .

JOURNAL OF LOW TEMPERATURE PHYSICS, 1995, 101 (5-6) :1099-1121

[4] Observation of surface-induced broken time-reversal symmetry in YBa2Cu3O7 tunnel junctions [J].

Covington, M ;

Aprili, M ;

Paraoanu, E ;

Greene, LH ;

Xu, F ;

Zhu, J ;

Mirkin, CA .

PHYSICAL REVIEW LETTERS, 1997, 79 (02) :277-280

[5] Tunneling into current-carrying surface states of high-T-c superconductors [J].

Fogelstrom, M ;

Rainer, D ;

Sauls, JA .

PHYSICAL REVIEW LETTERS, 1997, 79 (02) :281-284

[6] The spin gap and extended t-J model [J].

Fukuyama, H ;

Kohno, H .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 1997, 282 :124-127

[7] Theory of the quasiparticle spectra around a vortex in the two-dimensional t-J model [J].

Himeda, A ;

Ogata, M ;

Tanaka, Y ;

Kashiwaya, S .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1997, 66 (11) :3367-3370

[8] MIDGAP SURFACE-STATES AS A NOVEL SIGNATURE FOR D(X(A)(2)-X(B)(2))-WAVE SUPERCONDUCTIVITY [J].

HU, CR .

PHYSICAL REVIEW LETTERS, 1994, 72 (10) :1526-1529

[9] ORIGIN OF ZERO-BIAS CONDUCTANCE PEAKS IN HIGH-T-C SUPERCONDUCTORS [J].

KASHIWAYA, S ;

TANAKA, Y ;

KOYANAGI, M ;

TAKASHIMA, H ;

KAJIMURA, K .

PHYSICAL REVIEW B, 1995, 51 (02) :1350-1353

[10] Theory for tunneling spectroscopy of anisotropic superconductors [J].

Kashiwaya, S ;

Tanaka, Y ;

Koyanagi, M ;

Kajimura, K .

PHYSICAL REVIEW B, 1996, 53 (05) :2667-2676

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