中国物理B ›› 2021, Vol. 30 ›› Issue (12): 126802-126802.doi: 10.1088/1674-1056/ac003e

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Extended phase diagram of La1-xCaxMnO3 by interfacial engineering

Kexuan Zhang(张可璇)1, Lili Qu(屈莉莉)1, Feng Jin(金锋)1, Guanyin Gao(高关胤)1, Enda Hua(华恩达)1, Zixun Zhang(张子璕)1, Lingfei Wang(王凌飞)1,†, and Wenbin Wu(吴文彬)1,2,‡   

  1. 1 Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China;
    2 Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences, Hefei 230031, China
  • 收稿日期:2021-04-02 修回日期:2021-05-05 接受日期:2021-05-12 出版日期:2021-11-15 发布日期:2021-11-25
  • 通讯作者: Lingfei Wang, Wenbin Wu E-mail:wanglf@ustc.edu.cn;wuwb@ustc.edu.cn
  • 基金资助:
    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).

Extended phase diagram of La1-xCaxMnO3 by interfacial engineering

Kexuan Zhang(张可璇)1, Lili Qu(屈莉莉)1, Feng Jin(金锋)1, Guanyin Gao(高关胤)1, Enda Hua(华恩达)1, Zixun Zhang(张子璕)1, Lingfei Wang(王凌飞)1,†, and Wenbin Wu(吴文彬)1,2,‡   

  1. 1 Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China;
    2 Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences, Hefei 230031, China
  • Received:2021-04-02 Revised:2021-05-05 Accepted:2021-05-12 Online:2021-11-15 Published:2021-11-25
  • Contact: Lingfei Wang, Wenbin Wu E-mail:wanglf@ustc.edu.cn;wuwb@ustc.edu.cn
  • Supported by:
    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).

摘要: 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 LaLa1-xCaxMnO3/SrRuO3 superlattices and compared them with the LaLa1-xCaxMnO3 thin films and bulk compounds. The LaLa1-xCaxMnO3/SrRuO3 superlattices exhibit significant enhancement of Curie temperature (TC) beyond the corresponding thin films and bulks. Based on these results, we constructed an extended phase diagram of LaLa1-xCaxMnO3 under interfacial engineering. We considered the interfacial charge transfer and structural proximity effects as the origin of the interface-induced high TC. The structural characterizations revealed a pronounced increase of B-O-B bond angle, which could be the main driving force for the high TC 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.

关键词: interfacial engineering, oxygen octahedral coupling, charge transfer, oxide superlattices

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 LaLa1-xCaxMnO3/SrRuO3 superlattices and compared them with the LaLa1-xCaxMnO3 thin films and bulk compounds. The LaLa1-xCaxMnO3/SrRuO3 superlattices exhibit significant enhancement of Curie temperature (TC) beyond the corresponding thin films and bulks. Based on these results, we constructed an extended phase diagram of LaLa1-xCaxMnO3 under interfacial engineering. We considered the interfacial charge transfer and structural proximity effects as the origin of the interface-induced high TC. The structural characterizations revealed a pronounced increase of B-O-B bond angle, which could be the main driving force for the high TC 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.

Key words: interfacial engineering, oxygen octahedral coupling, charge transfer, oxide superlattices

中图分类号:  (Phase transitions and critical phenomena)

  • 68.35.Rh
68.65.Cd (Superlattices) 75.30.Et (Exchange and superexchange interactions) 75.25.Dk (Orbital, charge, and other orders, including coupling of these orders)