Inhomogeneous superconductivity in deeply underdoped Bi2Sr2CaCu2O8+δ

被引：2
|
作者：
Yamada, Y [1 ]
Suzuki, M [1 ]
机构：
[1] Kyoto Univ, Dept Elect Sci & Engn, Nishikyo Ku, Kyoto 6158510, Japan
来源：
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2005年 / 426卷
关键词：
interlayer tunneling spectroscopy; inhomogeneity;
D O I：
10.1016/j.physc.2005.02.047
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
To study electronic states in deeply underdoped cuprates, we have measured the interlayer tunneling spectra of Bi2Sr2CaCu2O8+delta (T-c = 44 K) realized by partially substituting Sr with La. A mesa structure is manufactured which is composed of 10 or less stacked intrinsic tunnel Josephson junctions. The tunneling characteristics exhibits a totally unknown behavior that the differential conductance increases significantly with decreasing temperature below Tc. This anomalous behavior observed only for deeply underdoped samples strongly suggest that inhomogeneous superconductivity or phase separation in CuO2 planes is essential bulk property of deeply underdoped cuprates. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：364 / 368
页数：5
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