Quasiclassical Theory of C4-Symmetric Magnetic Order in Disordered Multiband Metals
Quasiclassical Theory of C4-Symmetric Magnetic Order in Disordered Multiband Metals
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DOI：
10.3389/fphy.2020.00356
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发表时间：
2020-03
期刊：
影响因子：
--
通讯作者：
M. Dzero;M. Khodas
中科院分区：
文献类型：
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作者：
M. Dzero;M. Khodas
最近在铁基超导体的正常状态下进行的实验研究发现了c4对称（四方）流动磁态的存在。这种状态可以描述为具有两个不同磁矢量Q→1和Q→2的自旋密度波。考虑到铁离子中磁性的流动性质，我们建立了具有各向异性带结构的无序三带金属的四边形磁序的准经典理论。在我们的模型中，我们发现c4对称磁性与c2对称态竞争，只有一个Q→磁性结构向量。我们的主要结果是无序促进了四方磁态，这与早期的理论研究一致。
Recent experimental studies performed in the normal state of iron-based superconductors have discovered the existence of the C4-symmetric (tetragonal) itinerant magnetic state. This state can be described as a spin density wave with two distinct magnetic vectors Q→1 and Q→2. Given an itinerant nature of magnetism in iron-pnictides, we develop a quasiclassical theory of tetragonal magnetic order in disordered three-band metal with anisotropic band structure. Within our model we find that the C4-symmetric magnetism competes with the C2-symmetric state with a single Q→ magnetic structure vector. Our main results is that disorder promotes tetragonal magnetic state which is in agreement with earlier theoretical studies.