INTRINSIC FEATURES OF BI2SR2CACU2O8+DELTA TUNNELING SPECTRA - SCALING AND SYMMETRY OF THE ENERGY-GAP

被引：34

作者：

LIU, J

LI, YH

LIEBER, CM

机构：

[1] Harvard University, Cambridge

来源：

PHYSICAL REVIEW B | 1994年 / 49卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.49.6234

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Tunneling measurements have been made on a series of high-quality Bi2Sr2CaCU2O8+delta (BSCCO) single crystals with transition temperatures (T(c)) ranging from 79 to 92 K. From these systematic studies it has been possible to delineate the intrinsic features of the low-energy electronic spectrum in the BSCCO materials. These results demonstrate that the magnitude of 2DELTA at 4.2 K is nearly constant in the different T(c) samples, and thus, that 2DELTA/kT(c) increases as T(c) decreases. In addition, intrinsic quasiparticle excitations are detected within the gap irrespective of the sample T(c)'s. Analyses of these electronic spectra using a variety of pairing models suggest that gap functions having a large anisotropy can provide a good fit to the experimental data.

引用

收藏

页码：6234 / 6238

页数：5

相关论文

共 30 条

[11] ELECTRON-TUNNELING STUDY OF THE NORMAL AND SUPERCONDUCTING STATES OF BI1.7PB0.3SR2CACU2OX [J].

HUANG, Q ;

ZASADZINSKI, JF ;

GRAY, KE ;

LIU, JZ ;

CLAUS, H .

PHYSICAL REVIEW B, 1989, 40 (13) :9366-9369

[12] 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

[13] BOSON STRUCTURE IN THE QUASI-PARTICLE DENSITY OF STATES OF SUPERCONDUCTORS WITH NODES IN THE GAP [J].

JIANG, C ;

CARBOTTE, JP ;

DYNES, RC .

PHYSICAL REVIEW B, 1993, 47 (09) :5325-5331

[14] TEMPERATURE-DEPENDENCE OF THE ENERGY-GAP IN BI2SR2CACU2O8 SUPERCONDUCTORS BY HIGH-RESOLUTION ELECTRON-ENERGY-LOSS SPECTROSCOPY [J].

LI, YH ;

HUANG, JL ;

LIEBER, CM .

PHYSICAL REVIEW LETTERS, 1992, 68 (21) :3240-3243

[15] DEPENDENCE OF THE ENERGY-GAP ON T(C) - ABSENCE OF SCALING IN THE COPPER-OXIDE SUPERCONDUCTORS [J].

LI, YH ;

LIU, J ;

LIEBER, CM .

PHYSICAL REVIEW LETTERS, 1993, 70 (22) :3494-3497

[16] FEATURES OF THE DENSITY OF STATES OF HIGH-TC SUPERCONDUCTORS PROBED BY VACUUM TUNNELING [J].

LIU, JX ;

WAN, JC ;

GOLDMAN, AM ;

CHANG, YC ;

JIANG, PZ .

PHYSICAL REVIEW LETTERS, 1991, 67 (16) :2195-2198

[17]

Maki K., 1969, Superconductivity, vol.2, P1035

[18] WEAK-COUPLING THEORY OF HIGH-TEMPERATURE SUPERCONDUCTIVITY IN THE ANTIFERROMAGNETICALLY CORRELATED COPPER OXIDES [J].

MONTHOUX, P ;

BALATSKY, AV ;

PINES, D .

PHYSICAL REVIEW B, 1992, 46 (22) :14803-14817

[19] TOWARD A THEORY OF HIGH-TEMPERATURE SUPERCONDUCTIVITY IN THE ANTIFERROMAGNETICALLY CORRELATED CUPRATE OXIDES [J].

MONTHOUX, P ;

BALATSKY, AV ;

PINES, D .

PHYSICAL REVIEW LETTERS, 1991, 67 (24) :3448-3451

[20] SPIN-FLUCTUATION-INDUCED SUPERCONDUCTIVITY IN THE COPPER OXIDES - A STRONG COUPLING CALCULATION [J].

MONTHOUX, P ;

PINES, D .

PHYSICAL REVIEW LETTERS, 1992, 69 (06) :961-964