Tunneling spectroscopy of Tl2Ba2CuO6

被引：18

作者：

Ozyuzer, L

Yusof, Z

Zasadzinski, JF

Li, TW

Hinks, DG

Gray, KE

机构：

[1] Argonne Natl Lab, Ctr Sci & Technol, Superconduct & Mat Sci Div, Argonne, IL 60439 USA

[2] Izmir Inst Technol, Dept Phys, TR-35230 Izmir, Turkey

[3] IIT, Sci & Technol Ctr Superconduct, Chicago, IL 60616 USA

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 1999年 / 320卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

high-temperature superconductivity; tunneling; superconducting gap;

D O I：

10.1016/S0921-4534(99)00324-X

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

New results from tunneling spectroscopies on near optimally doped single crystals of Tl2Ba2CuO6 (Tl-2201) junctions are presented. The superconductor-insulator-normal metal (SIN) tunnel junctions are obtained using the point-contact technique with a Au tip. The tunneling conductances reproducibly show a sharp cusp-like subgap, prominent quasiparticle peaks with a consistent asymmetry, and weakly decreasing backgrounds. A rigorous analysis of the SIN tunneling data is performed using two different models for the d(x2-y2) (d-wave) density of states (DOS). Based on these and earlier results, the tunneling DOS of Tl-2201 has exhibited the most reproducible data that are consistent with a d-wave gap symmetry. We show that the dip feature at 26 that is clearly seen in SIN tunneling data of Bi2Sr2CaCu2O8+delta is also present in Tl-2201, but at a weaker level. The gap values for crystals with a bulk T-c = 86 K are in the range of 19-25 meV. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

收藏

页码：9 / 20

页数：12

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