title: Interfacial Control of Ferromagnetism in Ultrathin La0.67Ca0.33MnO3Sandwiched between CaRu1-xTixO3(x = 0-0.8) Epilayers.
abstract: 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(x2-y2) 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.
authors.affiliation: Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei 230026, China.
authors.forename: Binbin
authors.identifier: http://orcid.org/0000-0003-2690-4991
authors.initials: B
authors.lastname: Chen
authors.affiliation: Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei 230026, China.
authors.forename: Pingfan
authors.initials: P
authors.lastname: Chen
authors.affiliation: Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei 230026, China.
authors.forename: Haoran
authors.initials: H
authors.lastname: Xu
authors.affiliation: Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei 230026, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Jin
authors.affiliation: Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei 230026, China.
authors.forename: Zhuang
authors.initials: Z
authors.lastname: Guo
authors.affiliation: Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei 230026, China.
authors.forename: Da
authors.initials: D
authors.lastname: Lan
authors.affiliation: Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei 230026, China.
authors.forename: Siyuan
authors.initials: S
authors.lastname: Wan
authors.affiliation: Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei 230026, China.
authors.forename: Guanyin
authors.initials: G
authors.lastname: Gao
authors.affiliation: High Magnetic Field Laboratory, Chinese Academy of Sciences , Hefei 230031, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Chen
authors.affiliation: Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei 230026, China.|High Magnetic Field Laboratory, Chinese Academy of Sciences , Hefei 230031, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
authors.forename: Wenbin
authors.initials: W
authors.lastname: Wu
keywords: charge transfer; chemical doping; ferromagnetism; orbital order; oxide interface