Temperature dependence of tunneling spectra in YBa2Cu3O7-δ and Bi2Sr2CaCu2O8+δ single crystals

被引：12

作者：

Maggio-Aprile, I

Renner, C

Erb, A

Walker, E

Revaz, B

Genoud, JY

Kadowaki, K

Fischer, O

机构：

[1] Univ Geneva, DPMC, CH-1211 Geneva, Switzerland

[2] NEC Res Inst, Princeton, NJ 08540 USA

[3] Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 305, Japan

来源：

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA | 2000年 / 109卷 / 1-2期

关键词：

D O I：

10.1016/S0368-2048(00)00113-4

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

During past years, scanning tunneling spectroscopy (STS) investigations of high temperature superconductors have revealed unusual characteristics of the superconducting gap. We present here the temperature dependence of the tunneling conductance spectra on YBa2Cu3O7-delta and Bi2Sr2CaCu2O8+delta single crystals. We discuss similarities and differences between these two compounds. In particular we note that while in Bi2Sr2CaCu2O8+delta a pseudogap is observed above the critical temperature, even in overdoped samples, we find no indication of a pseudogap in optimally doped YBa2Cu3O7-delta above T-c. This is consistent with other striking differences between the two systems and supports the interpretation of the pseudogap in terms of strong superconducting correlations. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：147 / 155

页数：9

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