ENERGY-GAP OF THE HIGH-T(C) SUPERCONDUCTOR HGBA2CA2CU3O8+DELTA DETERMINED BY POINT-CONTACT SPECTROSCOPY

被引：37

作者：

JEONG, GT ^{[1
]}

KYE, JI ^{[1
]}

CHUN, SH ^{[1
]}

LEE, S ^{[1
]}

LEE, SI ^{[1
]}

KHIM, ZG ^{[1
]}

机构：

[1] POHANG INST SCI & TECHNOL,DEPT PHYS,KYUNGBUK 790600,SOUTH KOREA

来源：

PHYSICAL REVIEW B | 1994年 / 49卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.49.15416

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Tunneling spectra of a polycrystalline bulk HgBa2Ca2Cu3O8+delta with T(c) = 132 K have been measured by point-contact spectroscopy using a low-temperature scanning tunneling microscope. Unlike other high-T(c) superconductors the conductance of this material shows a BCS-like gap structure with a relatively small smearing parameter GAMMA. conductances with a linear density of states for \eV\ < DELTA and a small cusp at the gap are also observed. From a simple calculation based on the assumption that the surface is covered with a normal layer, we explained the linear dI/dV for \eV\ < DELTA and obtained two distinctively different energy gaps DELTA = 48 meV and 22 meV with the resultant 2DELTA/k(B)T(c) = 8.5 and 3.9, respectively.

引用

页码：15416 / 15419

页数：4

共 16 条

[1]

Chen J., UNPUB

[2]

de Gennes P. G., 1966, SUPERCONDUCTIVITY ME

[3] DIRECT MEASUREMENT OF QUASIPARTICLE-LIFETIME BROADENING IN A STRONG-COUPLED SUPERCONDUCTOR [J].

DYNES, RC ;

NARAYANAMURTI, V ;

GARNO, JP .

PHYSICAL REVIEW LETTERS, 1978, 41 (21) :1509-1512

[4] TUNNELING MEASUREMENTS OF THE DEPENDENCE OF THE ENERGY-GAP ON CRITICAL-TEMPERATURE IN LA2-XSRXCUO4-Y [J].

FEIN, AP ;

KIRTLEY, JR ;

SHAFER, MW .

PHYSICAL REVIEW B, 1988, 37 (16) :9738-9741

[5]

GAO LY, UNPUB

[6] REPRODUCIBLE TUNNELING DATA ON CHEMICALLY ETCHED SINGLE-CRYSTALS OF YBA2CU3O7 [J].

GURVITCH, M ;

VALLES, JM ;

CUCOLO, AM ;

DYNES, RC ;

GARNO, JP ;

SCHNEEMEYER, LF ;

WASZCZAK, JV .

PHYSICAL REVIEW LETTERS, 1989, 63 (09) :1008-1011

[7]

HASEGAWA T, 1992, PHYSICAL PROPERTIES, V3

[8] OBSERVATION OF A-B PLANE GAP ANISOTROPY IN BI2SR2CACU2O8 WITH A LOW-TEMPERATURE SCANNING TUNNELING MICROSCOPE [J].

KANE, J ;

CHEN, Q ;

NG, KW ;

TAO, HJ .

PHYSICAL REVIEW LETTERS, 1994, 72 (01) :128-131

[9] QUASI-PARTICLE-TUNNELING PROPERTIES OF BA1-XKXBIO3/BABI2OY/BA1-XKXBIO3 SANDWICH JUNCTIONS [J].

MARTIN, S ;

HELLMAN, ES ;

KUSSMAUL, A ;

HARTFORD, EH .

PHYSICAL REVIEW B, 1993, 47 (21) :14510-14513

[10] SUPERCONDUCTIVITY AT 94-K IN HGBA2CUO4+DELTA [J].

PUTILIN, SN ;

ANTIPOV, EV ;

CHMAISSEM, O ;

MAREZIO, M .

NATURE, 1993, 362 (6417) :226-228

← 1 2 →