Magnetism and superconductivity in ferromagnetic heavy-fermion system UCoGe under in-plane magnetic fields
Magnetism and superconductivity in ferromagnetic heavy-fermion system UCoGe under in-plane magnetic fields
复制标题
面内磁场下铁磁重费米子系统 UCoGe 的磁性和超导性
DOI：
10.1103/physrevb.93.174512
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发表时间：
2016
影响因子：
3.7
通讯作者：
and S. Fujimoto
中科院分区：
文献类型：
--
作者：
Y. Tada;S. Takayoshi;and S. Fujimoto
研究了常压下垂直于铁磁易磁化轴的面内磁场对铁磁超导体UCoGe的影响。结果表明，考虑到Dyaloshinskiii-Moriya相互作用所产生的曲折链晶体结构的UCoGe，我们可以定性地解释实验观察到的平面内各向异性的临界磁场的顺磁过渡。由于这种对磁场方向的强烈依赖性，由铁磁自旋涨落介导的超导性的上临界场也变得强烈各向异性。定性地解释了实验观察到的形轴是由于轴向磁场使居里温度降低而使自旋涨落增强的结果。我们还表明，形状是伴随着旋转的矢量，这将是一个关键，以了解实验不仅在环境压力下，而且在压力下。
We study the ferromagnetic superconductor UCoGe at ambient pressure under-plane magnetic fields, which are perpendicular to the ferromagnetic easy axis. It is shown that, by taking into account the Dyaloshinskii-Moriya interaction arising from the zigzag chain crystal structure of UCoGe, we can qualitatively explain the experimentally observed in-plane anisotropy for critical magnetic fields of the paramagnetic transition. Because of this strong dependence on the magnetic field direction, upper critical fields of superconductivity, which is mediated by ferromagnetic spin fluctuations, also become strongly anisotropic. The experimental observation of-shapedaxis is qualitatively explained as a result of enhancement of the spin fluctuations due to decreased Curie temperature by the-axis magnetic field. We also show that the-shapedis accompanied by a rotation of thevector, which would be a key to understand the experiments not only at ambient pressure but also under pressure.