Predominantly superconducting origin of large energy gaps in underdoped Bi2Sr2CaCu2O8+δ from tunneling spectroscopy

被引：198

作者：

Miyakawa, N

Zasadzinski, JF

Ozyuzer, L

Guptasarma, P

Hinks, DG

Kendziora, C

Gray, KE

机构：

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

[2] Sci Univ Tokyo, Dept Appl Phys, Shinjuku Ku, Tokyo 1628601, Japan

[3] IIT, Chicago, IL 60616 USA

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

[5] USN, Res Lab, Washington, DC 20375 USA

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 83卷 / 05期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.83.1018

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

New tunneling data are reported in Bi2Sr2CaCu2O8+delta which show quasiparticle excitation gaps, a, reaching values as high as 60 meV for underdoped crystals with T-c = 70 K. These energy gaps are nearly 3 times larger than those of overdoped crystals with similar T-c. Despite the large differences in gap magnitude, the tunneling spectra display qualitatively similar characteristics over the entire doping range. Detailed examination of the spectra, including the Josephson IcRn product measured in break junctions, indicates that these energy gaps are predominantly of superconducting origin.

引用

页码：1018 / 1021

页数：4

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