Superconducting anisotropy and evidence for intrinsic pinning in single crystalline MgB 2
Superconducting anisotropy and evidence for intrinsic pinning in single crystalline MgB 2
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单晶 MgB 2 中的超导各向异性和本征钉扎的证据
DOI：
10.1103/physrevb.66.012501
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
T. Ishida
中科院分区：
文献类型：
--
作者：
Ken’ichi Takahashi;Toshiyuki Atsumi;N. Yamamoto;Mingxiang Xu;H. Kitazawa;T. Ishida
通过测量单晶的磁矩，研究了金属高温超导体Mg B 2的超导各向异性γ c =（mc/ma B）1 / 2。在10 K时，各向异性γ c对外加磁场的依赖性不敏感。得到各向异性参数yc =4.31′0.14。当磁场平行于硼层施加时，扭矩曲线显示出尖锐的磁滞峰。这来自于本征钉扎，是硼层中超导性发生的实验证据。
We examine the superconducting anisotropy γ c =(m c /m a b ) 1 / 2 of a metallic high-T c superconductor MgB 2 by measuring the magnetic torque of a single crystal. The anisotropy γ c does not depend sensitively on the applied magnetic field at 10 K. We obtain the anisotropy parameter y c =4.31′0.14. The torque curve shows the sharp hysteresis peak when the field is applied parallel to the boron layers. This comes from the intrinsic pinning and is experimental evidence for the occurrence of superconductivity in the boron layers.