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Surface triggered stabilization of metastable charge-ordered phase in SrTiO3

Author

Listed:
  • Kitae Eom

    (Sungkyunkwan University (SKKU)
    Gachon University)

  • Bongwook Chung

    (Sungkyunkwan University (SKKU))

  • Sehoon Oh

    (Sungkyunkwan University (SKKU))

  • Hua Zhou

    (Argonne National Laboratory)

  • Jinsol Seo

    (Korea Institute of Energy Technology (KENTECH))

  • Sang Ho Oh

    (Korea Institute of Energy Technology (KENTECH))

  • Jinhyuk Jang

    (Pohang University of Science and Technology (POSTECH))

  • Si-Young Choi

    (Pohang University of Science and Technology (POSTECH))

  • Minsu Choi

    (Sungkyunkwan University (SKKU))

  • Ilwan Seo

    (Soongsil University)

  • Yun Sang Lee

    (Soongsil University)

  • Youngmin Kim

    (Ajou University)

  • Hyungwoo Lee

    (Ajou University
    Ajou University)

  • Jung-Woo Lee

    (Hongik University)

  • Kyoungjun Lee

    (University of Wisconsin-Madison)

  • Mark Rzchowski

    (University of Wisconsin)

  • Chang-Beom Eom

    (University of Wisconsin-Madison)

  • Jaichan Lee

    (Sungkyunkwan University (SKKU))

Abstract

Charge ordering (CO), characterized by a periodic modulation of electron density and lattice distortion, has been a fundamental topic in condensed matter physics, serving as a potential platform for inducing novel functional properties. The charge-ordered phase is known to occur in a doped system with high d-electron occupancy, rather than low occupancy. Here, we report the realization of the charge-ordered phase in electron-doped (100) SrTiO3 epitaxial thin films that have the lowest d-electron occupancy i.e., d1-d0. Theoretical calculation predicts the presence of a metastable CO state in the bulk state of electron-doped SrTiO3. Atomic scale analysis reveals that (100) surface distortion favors electron-lattice coupling for the charge-ordered state, and triggering the stabilization of the CO phase from a correlated metal state. This stabilization extends up to six unit cells from the top surface to the interior. Our approach offers an insight into the means of stabilizing a new phase of matter, extending CO phase to the lowest electron occupancy and encompassing a wide range of 3d transition metal oxides.

Suggested Citation

  • Kitae Eom & Bongwook Chung & Sehoon Oh & Hua Zhou & Jinsol Seo & Sang Ho Oh & Jinhyuk Jang & Si-Young Choi & Minsu Choi & Ilwan Seo & Yun Sang Lee & Youngmin Kim & Hyungwoo Lee & Jung-Woo Lee & Kyoung, 2024. "Surface triggered stabilization of metastable charge-ordered phase in SrTiO3," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45342-8
    DOI: 10.1038/s41467-024-45342-8
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