2-GAP STRUCTURE IN YB(Y)BA2CU3O7-X SINGLE-CRYSTALS

被引：33

作者：

AMINOV, BA

HEIN, MA

MULLER, G

PIEL, H

WEHLER, D

PONOMAREV, YG

ROSNER, K

WINZER, K

机构：

[1] PHYS UNIV GOTTINGEN,INST PHYS 1,GOTTINGEN,GERMANY

[2] MOSCOW MV LOMONOSOV STATE UNIV,MOSCOW 117234,RUSSIA

来源：

JOURNAL OF SUPERCONDUCTIVITY | 1994年 / 7卷 / 02期

关键词：

TUNNELING SPECTROSCOPY; HIGH-T(C) SUPERCONDUCTORS;

D O I：

10.1007/BF00724569

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Tunneling effects in YbBa2Cu3O7-x (YbBCO) and YbBa2Cu3O7-x (YBCO) single crystals have been investigated using an improved technique of break junction preparation. A two-gap structure with BCS-like density of states has been observed. The value of the ''large'' gap is in the range of 24-28 meV for YBCO (T(c) = 85-90 K) and 29-30 meV for YbBCO (T(c) = 87-90 K). A variation of the value of the ''small'' gap between 0.5 and 11 meV has been detected, even for the same crystal. As a possible explanation, two-band superconductivity, surface properties or strong gap anisotropy will be discussed.

引用

页码：361 / 365

页数：5

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