Strong dependence of the superconducting gap on oxygen doping from tunneling measurements on Bi2Sr2CaCu2O8-δ

被引：278

作者：

Miyakawa, N

Guptasarma, P

Zasadzinski, JF

Hinks, DG

Gray, KE

机构：

[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

[2] Argonne Natl Lab, Sci & Technol Ctr Supercond, Argonne, IL 60439 USA

[3] Sci Univ Tokyo, Dept Appl Phys, Shinjuku Ku, Tokyo 162, Japan

[4] IIT, Chicago, IL 60616 USA

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 80卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.80.157

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Tunneling measurements are reported for break junctions on Bi2Sr2CaCu2O8-delta Single crystals with various oxygen concentrations. Superconducting energy gaps a are observed in the underdoped samples which are considerably larger (similar to 30%) than found in optimal doped crystals. The trend of decreasing Delta and 2 Delta/kT(c), with increasing hole doping is continued into the overdoped region. Thus the superconducting gap and strong-coupling ratio change monotonically and dramatically over a narrow doping region where T-c, exhibits a maximum.

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页码：157 / 160

页数：4

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