Upper critical field, anisotropy, and superconducting properties of Ba1-xKxFe2As2 single crystals

被引：146

作者：

Wang, Zhao-Sheng ^{[1
]}

Luo, Hui-Qian

Ren, Cong

Wen, Hai-Hu

机构：

[1] Chinese Acad Sci, Inst Phys, Natl Lab Superconduct, Beijing 100190, Peoples R China

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.78.140501

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The temperature-dependent resistivity of Ba1-xKxFe2As2 (x=0.23, 0.25, 0.28, and 0.4) single crystals and the angle-dependent resistivity of superconducting Ba0.6K0.4Fe2As2 single crystals were measured in magnetic fields up to 9 T. The data measured on samples with different doping levels revealed very high upper critical fields, which increase with the transition temperature, and a very low superconducting anisotropy ratio Gamma=H-c2(ab)/H-c2(c)approximate to 2. By scaling the resistivity within the framework of the anisotropic Ginzburg-Landau theory, the angle-dependent resistivity of the Ba0.6K0.4Fe2As2 single crystal measured with different magnetic fields at a certain temperature collapsed onto one curve. As the only scaling parameter, the anisotropy Gamma was alternatively determined for each temperature and was found to be between two and three.

引用

页数：4

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