Effects of two-band superconductivity on the flux-line lattice in magnesium diboride.
Effects of two-band superconductivity on the flux-line lattice in magnesium diboride.
复制标题
双能带超导性对二硼化镁磁通线晶格的影响。
DOI：
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发表时间：
2003
影响因子：
8.6
通讯作者：
J. Karpiński
中科院分区：
文献类型：
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作者：
R. Cubitt;M. Eskildsen;C. Dewhurst;J. Jun;S. Kazakov;J. Karpiński
本文研究了MgB2中通量线晶格（FLL）的中子散射。在0.5 ~ 0.9 T之间，FLL发生了30度的重定向，同时散射强度急剧下降，表现为弱超导π带随着电场的增大而被抑制。我们推测，π和σ带有利于不同的FLL取向，并且重定向是由π带的抑制驱动的。当晶体的c轴与外加场旋转45度时，可以测量到穿透深度的各向异性，该各向异性随外加场和温度的变化而升高。
We present neutron scattering from the flux line lattice (FLL) in MgB2. Between 0.5 and 0.9 T the FLL undergoes a 30 degrees reorientation, and simultaneously the scattered intensity falls sharply consistent with the weaker superconducting pi band being suppressed with increasing field. We speculate that the pi and sigma bands favor different FLL orientations, and that the reorientation is driven by the suppression of the pi band. When the c axis of the crystal is rotated 45 degrees to the applied field the penetration depth anisotropy could be measured, and rises both as a function of applied field and temperature.