MANIFESTATION OF A CLEAR GAP STRUCTURE FROM POINT-CONTACT AND TUNNELING SPECTROSCOPY OF YBA2CU3O7-X AND YBBA2CU3O7-X SINGLE-CRYSTALS

被引：34

作者：

PONOMAREV, YG

BRANDT, NB

KHI, CS

TCHESNOKOV, SV

TSOKUR, EB

YARYGIN, AV

YUSUPOV, KT

AMINOV, BA

HEIN, MA

MULLER, G

PIEL, H

WEHLER, D

KRESIN, VZ

ROSNER, K

WINZER, K

WOLF, T

机构：

[1] BERG UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,D-42097 WUPPERTAL,GERMANY

[2] UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720

[3] UNIV GOTTINGEN,INST PHYS 1,D-37073 GOTTINGEN,GERMANY

[4] KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,INST TECH PHYS,D-76021 KARLSRUHE,GERMANY

来源：

PHYSICAL REVIEW B | 1995年 / 52卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.52.1352

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Methods of point-contact and tunneling spectroscopy have been used to determine the gap parameter Delta for single crystals of YBa2Cu3O7-x and YbBa2Cu3O7-x with critical temperature 60 K less than or equal to T-c less than or equal to 90 K. Sharp dips of the dynamic conductance dI/dV of point contacts at voltages V-n=2 Delta/(en)(n less than or equal to 8-9), as well as a clear gap structure in the I(V) characteristics of tunnel junctions give convincing evidence for the existence of a true superconducting gap in YBa2Cu3O7-x and YbBa2Cu3O7-x single crystals at least at T much less than T-c, as in conventional superconductors.

引用

页码：1352 / 1357

页数：6

共 31 条

[1]

AKIMENKO AI, 1991, Z PHYS B, V82, P82

[2] 2-GAP STRUCTURE IN YB(Y)BA2CU3O7-X SINGLE-CRYSTALS [J].

AMINOV, BA ;

HEIN, MA ;

MULLER, G ;

PIEL, H ;

WEHLER, D ;

PONOMAREV, YG ;

ROSNER, K ;

WINZER, K .

JOURNAL OF SUPERCONDUCTIVITY, 1994, 7 (02) :361-365

[3] TEMPERATURE-INDUCED TRANSITION FROM TUNNELING TO METALLIC BEHAVIOR OF BI(2-X)PB(X)SR2CA(N)CU(N+1)O(Y) (X=0.4, N=1 AND N=2) BREAK JUNCTIONS [J].

AMINOV, BA ;

HEIN, MA ;

MULLER, G ;

OSKINA, TE ;

PIEL, H ;

PONOMAREV, YG ;

TRETYAKOV, YD ;

WEHLER, D .

PHYSICA C, 1994, 224 (3-4) :321-329

[4] SUPERCONDUCTING TUNNELING WITHOUT THE TUNNELING HAMILTONIAN [J].

ARNOLD, GB .

JOURNAL OF LOW TEMPERATURE PHYSICS, 1985, 59 (1-2) :143-183

[5]

ARTEMENKO SN, 1979, ZH EKSP TEOR FIZ, V49, P924

[6]

BARONE A, 1982, PHYSICS APPLICATIONS

[7] METALLIC TO TUNNELING TRANSITION IN CU-NB POINT CONTACTS [J].

BLONDER, GE ;

TINKHAM, M .

PHYSICAL REVIEW B, 1983, 27 (01) :112-118

[8] TRANSITION FROM METALLIC TO TUNNELING REGIMES IN SUPERCONDUCTING MICRO-CONSTRICTIONS - EXCESS CURRENT, CHARGE IMBALANCE, AND SUPER-CURRENT CONVERSION [J].

BLONDER, GE ;

TINKHAM, M ;

KLAPWIJK, TM .

PHYSICAL REVIEW B, 1982, 25 (07) :4515-4532

[9] ELEMENTARY EXCITATIONS IN THE VICINITY OF A NORMAL METAL-SUPERCONDUCTING METAL CONTACT [J].

DEGENNES, PG ;

SAINTJAMES, D .

PHYSICS LETTERS, 1963, 4 (02) :151-152

[10] MULTIPLE ANDREEV SCATTERING IN SUPERCONDUCTOR NORMAL-METAL SUPERCONDUCTOR JUNCTIONS AS A TEST FOR ANISOTROPIC ELECTRON PAIRING [J].

DEVEREAUX, TP ;

FULDE, P .

PHYSICAL REVIEW B, 1993, 47 (21) :14638-14641

← 1 2 3 4 →