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Interfacial Control of Ferromagnetism in Ultrathin La0.67Ca0.33MnO3 Sandwiched between CaRu1–xTixO3 (x = 0–0.8) Epilayers

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posted on 2016-11-28, 00:00 authored by Binbin Chen, Pingfan Chen, Haoran Xu, Feng Jin, Zhuang Guo, Da Lan, Siyuan Wan, Guanyin Gao, Feng Chen, Wenbin Wu
Controlling functionalities in oxide heterostructures remains challenging for the rather complex interfacial interactions. Here, by modifying the interface properties with chemical doping, we achieve a nontrivial control over the ferromagnetism in ultrathin La0.67Ca0.33MnO3 (LCMO) layer sandwiched between CaRu1–xTixO3 [CRTO­(x)] epilayers. The Ti doping suppresses the interfacial electron transfer from CRTO­(x) to LCMO side; as a result, a steadily decreased Curie temperature with increasing x, from 262 K at x = 0 to 186 K at x = 0.8, is observed for the structures with LCMO fixed at 3.2 nm. Moreover, for more insulating CRTO­(x ≥ 0.5), the electron confinement induces an interfacial Mn-eg(x2y2) orbital order in LCMO which further attenuates the ferromagnetism. Also, in order to characterize the heterointerfaces, for the first time the doping- and thickness-dependent metal–insulator transitions in CRTO­(x) films are examined. Our results demonstrate that the LCMO/CRTO­(x) heterostructure could be a model system for investigating the interfacial multiple interactions in correlated oxides.

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