中国物理B ›› 2021, Vol. 30 ›› Issue (8): 87401-087401.doi: 10.1088/1674-1056/abea97

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Epitaxial growth and transport properties of compressively-strained Ba2IrO4 films

Yun-Qi Zhao(赵蕴琦)1,†, Heng Zhang(张衡)1,†, Xiang-Bin Cai(蔡祥滨)2, Wei Guo(郭维)1, Dian-Xiang Ji(季殿祥)1, Ting-Ting Zhang(张婷婷)1, Zheng-Bin Gu(顾正彬)1, Jian Zhou(周健)1,‡, Ye Zhu(朱叶)3,§, and Yue-Feng Nie(聂越峰)1,¶   

  1. 1 National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China;
    2 Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China;
    3 Department of Applied Physics, Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
  • 收稿日期:2021-01-08 修回日期:2021-02-07 接受日期:2021-03-01 出版日期:2021-07-16 发布日期:2021-07-23
  • 通讯作者: Jian Zhou, Ye Zhu, Yue-Feng Nie E-mail:zhoujian@nju.edu.cn;yezhu@polyu.edu.hk;ynie@nju.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11774153, 11861161004, 51772143, 11974163, and 51672125), the National Key Research and Development Program of China (Grant No. 2016YFA0201104), the Fundamental Research Funds for the Central Universities, China (Grant Nos. 0213-14380167 and 0213-14380198), and the Hong Kong Research Grants Council (RGC) through the NSFC-RGC Joint Research Scheme, China (Grant No. N_PolyU531/18). {These authors contributed equally to this work.

Epitaxial growth and transport properties of compressively-strained Ba2IrO4 films

Yun-Qi Zhao(赵蕴琦)1,†, Heng Zhang(张衡)1,†, Xiang-Bin Cai(蔡祥滨)2, Wei Guo(郭维)1, Dian-Xiang Ji(季殿祥)1, Ting-Ting Zhang(张婷婷)1, Zheng-Bin Gu(顾正彬)1, Jian Zhou(周健)1,‡, Ye Zhu(朱叶)3,§, and Yue-Feng Nie(聂越峰)1,¶   

  1. 1 National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China;
    2 Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China;
    3 Department of Applied Physics, Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
  • Received:2021-01-08 Revised:2021-02-07 Accepted:2021-03-01 Online:2021-07-16 Published:2021-07-23
  • Contact: Jian Zhou, Ye Zhu, Yue-Feng Nie E-mail:zhoujian@nju.edu.cn;yezhu@polyu.edu.hk;ynie@nju.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11774153, 11861161004, 51772143, 11974163, and 51672125), the National Key Research and Development Program of China (Grant No. 2016YFA0201104), the Fundamental Research Funds for the Central Universities, China (Grant Nos. 0213-14380167 and 0213-14380198), and the Hong Kong Research Grants Council (RGC) through the NSFC-RGC Joint Research Scheme, China (Grant No. N_PolyU531/18). {These authors contributed equally to this work.

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摘要： Ba2IrO4 is a sister compound of the widely investigated Sr2IrO4 and has no IrO6 octahedral rotation nor net canted antiferromagnetic moment, thus it acts as a system more similar to the high-Tc cuprate. In this work, we synthesize the Ba2IrO4 epitaxial films by reactive molecular beam epitaxy and study their crystalline structure and transport properties under biaxial compressive strain. High resolution scanning transmission electron microscopy and x-ray diffraction confirm the high quality of films with partial strain relaxation. Under compressive epitaxial strain, the Ba2IrO4 exhibits the strain-driven enhancement of the conductivity, consistent with the band gap narrowing and the stronger hybridization of Ir-t2g and O-2p orbitals predicted in the first-principles calculations.

关键词: molecular beam epitaxy, iridate oxides, epitaxial strain, transport properties

Abstract: Ba2IrO4 is a sister compound of the widely investigated Sr2IrO4 and has no IrO6 octahedral rotation nor net canted antiferromagnetic moment, thus it acts as a system more similar to the high-Tc cuprate. In this work, we synthesize the Ba2IrO4 epitaxial films by reactive molecular beam epitaxy and study their crystalline structure and transport properties under biaxial compressive strain. High resolution scanning transmission electron microscopy and x-ray diffraction confirm the high quality of films with partial strain relaxation. Under compressive epitaxial strain, the Ba2IrO4 exhibits the strain-driven enhancement of the conductivity, consistent with the band gap narrowing and the stronger hybridization of Ir-t2g and O-2p orbitals predicted in the first-principles calculations.

Key words: molecular beam epitaxy, iridate oxides, epitaxial strain, transport properties

中图分类号:  (Superconducting materials other than cuprates)

  • 74.70.-b
74.78.-w (Superconducting films and low-dimensional structures)