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Anisotropy of the upper critical field in c-axis oriented MgB2 thin films |
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| Authors: | Wang Shu-Fang Liu Zhen Zhu Ya-Bin Zhou Yue-Liang Chen Zheng-Hao Lü Hui-Bin Yang Guo-Zhen |
| Institution: | Laboratory of Optical Physics, Institute of Physics & Centre of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; Laboratory of Optical Physics, Institute of Physics & Centre of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; Physics & Technology College, Hebei University, Baoding 071002, China |
| Abstract: | C-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 γ=1.2. |
| Keywords: | MgB2 thin films anisotropy upper critical field chemical vapour deposition |
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