碳微纤维和蓝宝石上的NiBi3薄膜的超导和临界电流特性
Superconducting and Critical Current Properties of NiBi3 Thin Films on Carbon Microfibers and Sapphire
摘要：
本文报道了在碳微纤维和蓝宝石衬底上制备的NiBi_3薄膜的超导特性和临界电流特性。用直径为7 μm的Ni涂层碳纤维（~ 80 nm）与Bi蒸气反应制备了NiBi 3涂层碳微纤维，并通过电子束沉积Ni膜（~ 40 ~ 120 nm）在蓝宝石上暴露于Bi蒸气形成了薄膜。微纤维和薄膜显示Tc = 4.3 K和4.4 K，分别略高于大块多晶NiBi 3。临界电流密度（Jc）的测量低于转变温度，并很好地描述了金兹伯格-朗道幂律。
英文摘要：
The superconducting and critical current properties of thin films of NiBi3 formed on the surface of carbon microfibers and sapphire substrates are reported. The NiBi3 coated carbon microfibers were prepared by reacting 7 μm diameter Ni-coated (~ 80 nm) carbon fibers with Bi vapor, and thin films on sapphire were formed by exposing electron-beam deposited Ni films (~ 40 - 120 nm) to Bi vapor. The microfibers and films show Tc = 4.3 K and 4.4 K,respectively, which were slightly higher than that reported for bulk polycrystalline NiBi3. The critical current density (Jc) was measured below the transition temperature and is well described by the Ginzburg-Landau power-law.
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