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Interface-induced magnetic polar metal phase in complex oxides

Author

Listed:
  • Meng Meng

    (Louisiana State University)

  • Zhen Wang

    (Louisiana State University
    Brookhaven National Laboratory)

  • Aafreen Fathima

    (SRM Institute of Science and Technology)

  • Saurabh Ghosh

    (SRM Institute of Science and Technology
    Vanderbilt University
    Oak Ridge National Laboratory)

  • Mohammad Saghayezhian

    (Louisiana State University)

  • Joel Taylor

    (Louisiana State University)

  • Rongying Jin

    (Louisiana State University)

  • Yimei Zhu

    (Brookhaven National Laboratory)

  • Sokrates T. Pantelides

    (Vanderbilt University
    Oak Ridge National Laboratory)

  • Jiandi Zhang

    (Louisiana State University)

  • E. W. Plummer

    (Louisiana State University)

  • Hangwen Guo

    (Louisiana State University)

Abstract

Polar metals are commonly defined as metals with polar structural distortions. Strict symmetry restrictions make them an extremely rare breed as the structural constraints favor insulating over metallic phase. Moreover, no polar metals are known to be magnetic. Here we report on the realization of a magnetic polar metal phase in a BaTiO3/SrRuO3/BaTiO3 heterostructure. Electron microscopy reveals polar lattice distortions in three-unit-cells thick SrRuO3 between BaTiO3 layers. Electrical transport and magnetization measurements reveal that this heterostructure possesses a metallic phase with high conductivity and ferromagnetic ordering with high saturation moment. The high conductivity in the SrRuO3 layer can be attributed to the effect of electrostatic carrier accumulation induced by the BaTiO3 layers. Density-functional-theory calculations provide insights into the origin of the observed properties of the thin SrRuO3 film. The present results pave a way to design materials with desired functionalities at oxide interfaces.

Suggested Citation

  • Meng Meng & Zhen Wang & Aafreen Fathima & Saurabh Ghosh & Mohammad Saghayezhian & Joel Taylor & Rongying Jin & Yimei Zhu & Sokrates T. Pantelides & Jiandi Zhang & E. W. Plummer & Hangwen Guo, 2019. "Interface-induced magnetic polar metal phase in complex oxides," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
  • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-13270-7
    DOI: 10.1038/s41467-019-13270-7
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