Irreversibility field and coherence length of Ca-substituted YBCO single crystals

被引：7

作者：

Masui, T ^{[1
]}

Ohmichi, E

Tajima, S

Osada, T

机构：

[1] Osaka Univ, Grad Sch Sci, Dept Phys, Toyonaka, Osaka 5600043, Japan

[2] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2005年 / 426卷

关键词：

YBCO; irreversibility field; coherence length; superconducting fluctuation;

D O I：

10.1016/j.physc.2005.01.029

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The irreversibility fields of Ca-YBCO single crystals are estimated from torque measurement and dc-resistivity. The small anisotropy about 3 is related to the heavy overdoping with help of Ca-substitution. For the optimally doped Ca-YBCO, the irreversibility field is lower than that for the Ca-free YBCO, when compared at a fixed TIT, Since the former has more oxygen deficiencies, this result contradicts with the general understanding that CuO-chain deficiency is considered to enhance vortex pinning. The resistivity in magnetic fields shows that fluctuation effect is largely suppressed for heavily overdoped Ca-YBCO. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：335 / 339

页数：5

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