中国物理B ›› 2022, Vol. 31 ›› Issue (12): 126801-126801.doi: 10.1088/1674-1056/ac8725

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Anomalous strain effect in heteroepitaxial SrRuO3 films on (111) SrTiO3 substrates

Zhenzhen Wang(王珍珍)1,2, Weiheng Qi(戚炜恒)2,3, Jiachang Bi(毕佳畅)4, Xinyan Li(李欣岩)1, Yu Chen(陈雨)3, Fang Yang(杨芳)1, Yanwei Cao(曹彦伟)4, Lin Gu(谷林)5, Qinghua Zhang(张庆华)1, Huanhua Wang(王焕华)3, Jiandi Zhang(张坚地)1, Jiandong Guo(郭建东)1,2,6,†, and Xiaoran Liu(刘笑然)1,‡   

  1. 1 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;
    4 Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;
    5 Beijing National Center for Electron Microscopy and Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;
    6 Songshan Lake Materials Laboratory, Dongguan 523808, China
  • 收稿日期:2022-05-04 修回日期:2022-06-19 接受日期:2022-08-05 出版日期:2022-11-11 发布日期:2022-11-11
  • 通讯作者: Jiandong Guo, Xiaoran Liu E-mail:jdguo@iphy.ac.cn;xiaoran.liu@iphy.ac.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0303600), the National Natural Science Foundation of China (Grant No. 11974409), and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB33000000).

Anomalous strain effect in heteroepitaxial SrRuO3 films on (111) SrTiO3 substrates

Zhenzhen Wang(王珍珍)1,2, Weiheng Qi(戚炜恒)2,3, Jiachang Bi(毕佳畅)4, Xinyan Li(李欣岩)1, Yu Chen(陈雨)3, Fang Yang(杨芳)1, Yanwei Cao(曹彦伟)4, Lin Gu(谷林)5, Qinghua Zhang(张庆华)1, Huanhua Wang(王焕华)3, Jiandi Zhang(张坚地)1, Jiandong Guo(郭建东)1,2,6,†, and Xiaoran Liu(刘笑然)1,‡   

  1. 1 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;
    4 Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;
    5 Beijing National Center for Electron Microscopy and Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;
    6 Songshan Lake Materials Laboratory, Dongguan 523808, China
  • Received:2022-05-04 Revised:2022-06-19 Accepted:2022-08-05 Online:2022-11-11 Published:2022-11-11
  • Contact: Jiandong Guo, Xiaoran Liu E-mail:jdguo@iphy.ac.cn;xiaoran.liu@iphy.ac.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0303600), the National Natural Science Foundation of China (Grant No. 11974409), and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB33000000).

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摘要： We report comprehensive investigations into the structure of high-quality (111)-oriented SrRuO3 films on SrTiO3 substrates to elucidate the effect of (111) heteroepitaxial strain. We found that SrRuO3 film with a thickness of ～ 40 nm is compressively strained in plane on the substrate with full coherency. Nevertheless, the out-of-plane spacing is almost the same as in the bulk, which is at odds with the conventional paradigm. By probing a series of half-order Bragg reflections using synchrotron-based x-ray diffraction combined with analyses of the scanning transmission electron microscopy images, we discovered that the heteroepitaxial strain is accommodated via significant suppression of the degree of c+ octahedral tilting and the formation of three equivalent domain structures on the (111) SrTiO3 substrate. This anomalous effect sheds light on the understanding of an unconventional paradigm of film-substrate coupling for the (111) heteroepitaxial strain.

关键词: perovskite SrRuO3, (111)-oriented thin films, heteroepitaxial strain, octahedral tilt and rotation

Abstract: We report comprehensive investigations into the structure of high-quality (111)-oriented SrRuO3 films on SrTiO3 substrates to elucidate the effect of (111) heteroepitaxial strain. We found that SrRuO3 film with a thickness of ～ 40 nm is compressively strained in plane on the substrate with full coherency. Nevertheless, the out-of-plane spacing is almost the same as in the bulk, which is at odds with the conventional paradigm. By probing a series of half-order Bragg reflections using synchrotron-based x-ray diffraction combined with analyses of the scanning transmission electron microscopy images, we discovered that the heteroepitaxial strain is accommodated via significant suppression of the degree of c+ octahedral tilting and the formation of three equivalent domain structures on the (111) SrTiO3 substrate. This anomalous effect sheds light on the understanding of an unconventional paradigm of film-substrate coupling for the (111) heteroepitaxial strain.

Key words: perovskite SrRuO3, (111)-oriented thin films, heteroepitaxial strain, octahedral tilt and rotation

中图分类号:  (Thin film structure and morphology)

  • 68.55.-a
77.80.bn (Strain and interface effects) 81.15.-z (Methods of deposition of films and coatings; film growth and epitaxy)