论文标题
lacoo $ _3 $电影的铁磁性
Ferromagnetism of LaCoO$_3$ films
论文作者
论文摘要
我们使用数值模拟研究了拉伸紧张的lacoo $ _3 $中的铁磁有序和微观不均匀性。我们认为，这两种现象均源于在中间自旋激发中介导的高旋转（HS）状态中原子之间的有效甲基交换相互作用。我们将HS激发的模型推导为裸露的原子状态，该状态在邻居原子上穿着电子和电子孔波动。我们构建了一系列近似值，以说明负责HS波动和磁交换的电子相关效应。 “打扮” HS状态之间获得的磁耦合的幅度和定向依赖性与实验观测显示了定性的一致性，并提供了Lacoo $ _3 $胶片的新物理图片。
We study ferromagnetic ordering and microscopic inhomogeneity in tensile strained LaCoO$_3$ using numerical simulations. We argue that both phenomena originate from effective superexchange interactions between atoms in the high-spin (HS) state mediated by the intermediate-spin excitations. We derive a model of the HS excitation as a bare atomic state dressed by electron and electron-hole fluctuations on the neighbor atoms. We construct a series of approximations to account for electron correlation effects responsible for HS fluctuations and magnetic exchange. The obtained amplitudes and directional dependence of magnetic couplings between the "dressed" HS states show a qualitative agreement with experimental observations and provide a new physical picture of LaCoO$_3$ films.
