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首页> 外文期刊>Physical review >Band structure of magnetic excitations in the vortex phase of a ferromagnetic superconductor
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Band structure of magnetic excitations in the vortex phase of a ferromagnetic superconductor

机译：铁磁超导体涡旋相中磁激发的能带结构

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摘要

Magnetic excitations in a ferromagnetic superconductor in the presence of an Abrikosov vortex lattice have been studied using the phenomenological London and Landau-Lifshitz equations. Due to the periodicity of the vortex field the magnon spectrum has a band structure, similar to the structure of the electon spectrum in a crystal lattice. The gaps between adjacent bands have been calculated using an analog of the weak-binding approximation. When the applied magnetic field is altered the band structure undergoes a qualitative transformation due to commensurability effects, connected with the nonmonotonicity of the magnon spectrum in the Meissner state. In dirty samples the energy gaps may be smeared out because of the dissipation connected with vortex motion. In sufficiently clean samples the gaps manifest themselves as maxima in the frequency dependence of the microwave reflectivity coefficient.
机译：已经使用现象学的伦敦和兰道-利夫希茨方程研究了在存在Abrikosov涡旋晶格的情况下铁磁超导体中的磁激发。由于涡流场的周期性，磁振子频谱具有能带结构，类似于晶格中电子谱的结构。相邻带之间的间隙已使用弱结合近似法计算得出。当施加的磁场发生变化时，由于相称效应，能带结构发生了质变，这与迈斯纳状态下的马农波谱的非单调性有关。在肮脏的样品中，由于与涡旋运动有关的耗散，能隙可能会被抹去。在足够干净的样品中，间隙在微波反射系数的频率相关性中表现为最大值。

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