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Enhanced Magnetic Anisotropy and Orbital Symmetry Breaking in Manganite Heterostructures

机译：锰异质结构中增强的磁各向异性和轨道对称性破坏

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Manipulating magnetic anisotropy in complex oxide heterostructures has attracted much attention. Here, three interface-engineering approaches are applied to address two general issues with controlling magnetic anisotropy in the La2/3Sr1/3MnO3 heterostructure. One is the paradox arising from the competition between Mn-3d-O-2p orbital hybridization and MnO6 crystal field. The other is the interfacial region where the nonuniform Mn-O bond length d and Mn-O-Mn bond angle theta disturb the structural modulation. When the interfacial region is suppressed in the interface-engineered samples, the lateral magnetic anisotropy energy is increased eighteen times. The d-mediated anisotropic crystal filed that overwhelms the orbital hybridization causes the lateral symmetry breaking of the Mn 3d(x)(-)(y)(2)(2) orbital, resulting in enhanced magnetic anisotropy. This is different from the classic Jahn-Teller effect where the lateral symmetry is always preserved. Moreover, the quantitative analysis on X-ray linear dichroism data suggests a direct correlation between Mn 3d(x)(-)(y)(2)(2) orbital symmetry breaking and magnetic anisotropy energy. The findings not only advance the understanding of magnetic anisotropy in manganite heterostructures but also can be extended to other complex oxides and perovskite materials with correlated degrees of freedom.
机译：在复杂的氧化物异质结构中操纵磁各向异性已经引起了广泛的关注。在这里，应用三种界面工程方法来解决控制La2 / 3Sr1 / 3MnO3异质结构中的磁各向异性的两个一般性问题。一种是由Mn-3d-O-2p轨道杂交与MnO6晶体场之间的竞争引起的悖论。另一个是界面区域，其中不均匀的Mn-O键长d和Mn-O-Mn键角theta干扰了结构调制。当界面工程样本中的界面区域受到抑制时，横向磁各向异性能量将增加18倍。 d-介导的各向异性晶体使轨道杂交不堪重负，导致Mn 3d（x）（-）（y）（2）（2）轨道横向对称断裂，从而增强了磁各向异性。这与经典的Jahn-Teller效应不同，后者始终保持横向对称。此外，对X射线线性二向色性数据的定量分析表明，Mn 3d（x）（-）（y）（2）（2）轨道对称破坏与磁各向异性能之间具有直接相关性。这些发现不仅促进了对锰异质结构中磁各向异性的理解，而且可以扩展到具有相关自由度的其他复杂氧化物和钙钛矿材料。

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