Electric field driven octahedral rotation in Sr2RuO4 and its underlying mechanism

ORAL

Abstract

One of the key goals in the research of perovskite transition metal oxides (TMOs) is to design and control their physical properties, for which MO6 (M=transition metal) octahedron rotation (OR) is considered to be one of the key control parameters. We show, through a combined study of angle resolved photoemission, low energy electron diffraction and first-principles calculations, that OR can be induced and thus be tuned with electric field in Sr2RuO4. Originally rotated octahedra in the surface layer of Sr2RuO4 are restored to the bulk structure upon K dosing on the surface. Our theoretical investigation shows that OR in Sr2RuO4 originates from surface electric field which can be controlled via the screening effect of the overlaid K layer and that the variation of Sr-Sr vertical distance is responsible for the coupling between OR and electric field. Our finding raises a possibility for electric field control of physical properties through the variation of the OR angle even for non-piezoelectric materials.

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Presenters

  • Wonshik Kyung

    Lawrence Berkeley National Laboratory

Authors

  • Wonshik Kyung

    Lawrence Berkeley National Laboratory

  • Choong Hyun Kim

    Center for Correlated Electron Systems, Institute for Basic Science & Seoul National Univeristy, Center for Correlated Electron Systems, Institute for Basic Science, Department of Physics and Astronomy, Seoul National University, Seoul National University, CCES-IBS

  • Yeong Kwan Kim

    KAIST

  • Beomyoung Kim

    Lawrence Berkeley National Laboratory

  • Chul Kim

    Yonsei University

  • Woobin Jung

    CCES-IBS, IBS-CCES, Seoul National University

  • Junyoung Kwon

    CCES-IBS, Institute for Basic Science

  • Minsoo Kim

    CCES-IBS

  • Aaron Bostwick

    Advanced Light Source, E.O. Lawrence Berkeley National Lab, Berkeley, CA 94720, USA, Advanced Light Source, Lawrence Berkeley National Laboratory, ALS, Lawrence National Berkeley Laboratory, Advanced Light Source, Lawrence Berkeley National Lab, Lawrence Berkeley National Laboratory, Advanced Light Source (ALS), E. O. Lawrence Berkeley National Laboratory, USA, Advanced Light Source, E. O. Lawrence Berkeley National Laboratory

  • Jonathan Denlinger

    ALS, Lawrence Berkeley National Laboratory, Lawrence Berkeley National Laboratory, Lawrence Berkeley National Labotatory, Advanced Light Source, Lawrence Berkeley National Laboratory, Lawrence Berkeley Natl Lab

  • Yoshiyuki Yoshida

    AIST, National Institute of Advanced Industrial Science and Technology), National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan, National Institute of Advanced Industrial Science and Technology

  • Changyoung Kim

    Department of Physics and Astronomy, Seoul National University (SNU), Physics and astronomy, Seoul National University, Seoul National University, CCES-IBS, Institute for Basic Science, IBS-CCES, Seoul National University