Extended phase diagram of La1-xCaxMnO3 by interfacial engineering

doi:10.1088/1674-1056/ac003e

Abstract The interfacial enhanced ferromagnetism in maganite/ruthenate system is regarded as a promising path to broaden the potential of oxide-based electronic device applications. Here, we systematically studied the physical properties of LaLa_1-xCa_xMnO₃/SrRuO₃ superlattices and compared them with the LaLa_1-xCa_xMnO₃ thin films and bulk compounds. The LaLa_1-xCa_xMnO₃/SrRuO₃ superlattices exhibit significant enhancement of Curie temperature (T_C) beyond the corresponding thin films and bulks. Based on these results, we constructed an extended phase diagram of LaLa_1-xCa_xMnO₃ under interfacial engineering. We considered the interfacial charge transfer and structural proximity effects as the origin of the interface-induced high T_C. The structural characterizations revealed a pronounced increase of B-O-B bond angle, which could be the main driving force for the high T_C in the superlattices. Our work inspires a deeper understanding of the collective effects of interfacial charge transfer and structural proximity on the physical properties of oxide heterostructures.

Keywords: interfacial engineering oxygen octahedral coupling charge transfer oxide superlattices

Received: 02 April 2021
Revised: 05 May 2021
Accepted manuscript online: 12 May 2021

PACS:	68.35.Rh	(Phase transitions and critical phenomena)
	68.65.Cd	(Superlattices)
	75.30.Et	(Exchange and superexchange interactions)
	75.25.Dk	(Orbital, charge, and other orders, including coupling of these orders)

Fund: Project supported by the National Key Research and Development Program of China (Grant Nos. 2016YFA0401003, 2017YFA0403502, and 2020YFA0309100), the National Natural Science Foundation of China (Grant Nos. 11974326, 12074365, 11804342, U2032218, and 51872278), the Fundamental Research Funds for the Central Universities, China (Grant Nos. WK2030000035 and WK2340000102), and Hefei Science Center of Chinese Academy of Sciences (Grant No. 2020HSC-UE014).

Corresponding Authors: Lingfei Wang, Wenbin Wu
E-mail: wanglf@ustc.edu.cn;wuwb@ustc.edu.cn

Cite this article:

Kexuan Zhang(张可璇), Lili Qu(屈莉莉), Feng Jin(金锋), Guanyin Gao(高关胤), Enda Hua(华恩达), Zixun Zhang(张子璕), Lingfei Wang(王凌飞), and Wenbin Wu(吴文彬) Extended phase diagram of La_1-xCa_xMnO₃ by interfacial engineering 2021 Chin. Phys. B 30 126802

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Extended phase diagram of La1-xCaxMnO3 by interfacial engineering

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Extended phase diagram of La_1-xCa_xMnO₃ by interfacial engineering