Anisotropy of the upper critical field in c-axis oriented MgB2 thin films
Wang Shu-Fang (王淑芳)ab, Liu Zhen (刘震)a, Zhu Ya-Bin (朱亚彬)a, Zhou Yue-Liang (周岳亮)a, Chen Zheng-Hao (陈正豪)a, Lü Hui-Bin (吕惠宾)a, Yang Guo-Zhen (杨国桢)a,
a Laboratory of Optical Physics, Institute of Physics & Centre of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; b Physics & Technology College, Hebei University, Baoding 071002, China
AbstractC-axis oriented MgB$_2$ thin films were synthesized on single-crystal MgO (111) substrates using a chemical vapour deposition technique. The as-formed films revealed a sharp superconducting transition temperature of 38K with the transition width 0.2K. The temperature dependence of the upper critical magnetic field $H_{c2}(T)$ in the films was determined via resistivity for magnetic field H parallel and perpendicular to the c axis of the films. Using the Werthamer－Helfand－Hohenberg formula, we obtained the anisotropy ratio of the upper critical field $\gamma$=1.2.
Received: 08 October 2003
Revised: 09 December 2003
Accepted manuscript online:
Fund: Project supported by the State Key Programme for Basic Research of China (Grant No 1999064604).
Cite this article:
Wang Shu-Fang (王淑芳), Liu Zhen (刘震), Zhu Ya-Bin (朱亚彬), Zhou Yue-Liang (周岳亮), Chen Zheng-Hao (陈正豪), Lü Hui-Bin (吕惠宾), Yang Guo-Zhen (杨国桢) Anisotropy of the upper critical field in c-axis oriented MgB2 thin films 2004 Chinese Physics 13 1120
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