Magnetic anisotropy from linear defect structures in correlated electron systems
Magnetic anisotropy from linear defect structures in correlated electron systems
复制标题
DOI：
10.1103/physrevb.103.245132
复制
发表时间：
2020-12
期刊：
影响因子：
--
通讯作者：
Mainak Pal;Laetitia P. Bettmann;A. Kreisel;P. Hirschfeld
中科院分区：
文献类型：
--
作者：
Mainak Pal;Laetitia P. Bettmann;A. Kreisel;P. Hirschfeld
相关电子系统，特别是铁基超导体，对晶体生长过程中不可避免地发生的应变非常敏感。这种类型的内置应变已被提出作为一个可能的解释，实验中观察到在高温下对应于名义上的tetraphthalocyanine相的有序。在这里，我们研究了一个简单的微观模型的应变诱导位错的存在下的电子相关性，它创建的缺陷状态，可以驱动这种磁各向异性，如果自旋轨道相互作用存在。这样的缺陷可能出现，例如，在铁基体系中或在铜酸盐中的Cu-O链中。我们估计的贡献，这些位错磁各向异性检测电流转矩磁力实验。
Correlated electron systems, particularly iron-based superconductors, are extremely sensitive to strain, which inevitably occurs in the crystal growth process. Built-in strain of this type has been proposed as a possible explanation for experiments where nematic order has been observed at high temperatures corresponding to the nominally tetragonal phase. Here we investigate a simple microscopic model of a strain-induced dislocation in the presence of electronic correlations, which create defect states that can drive magnetic anisotropy of this kind, if spin orbit interaction is present. Such defects can arise, e.g., in Fe-based systems or in Cu-O chains in cuprates. We estimate the contribution of these dislocations to magnetic anisotropy as detected by current torque magnetometry experiments.