High-pressure synthesis, crystal structure, and physical properties of perovskite KOsO3

ORAL

Abstract

The syntheses of LiOsO3 and NaOsO3 have brought some fresh input to the long-standing dialogs of ferroelectric metal and the metal-insulator transition. The LiOsO3 with the LiNbO3-type structure has been believed to be the best candidate for the ferroelectric metal proposed by Anderson and Blount [1]. Whether the metal-insulator transition in the orthorhombic perovskite NaOsO3 [2] can be attributed to either a Mott transition or a Slater transition is still controversial [3,4].  KOsO3 in this family has been synthesized under a high-pressure and high-temperature condition for the first time. As the geometric tolerance factor is close to 1, the perovskite KOsO3 crystallizes in a cubic structure (Pm-3m). The cubic phase remains stable for a large range of the Na doping in K1-xNaxOsO3. The perovskite KOsO3 and the Na-doped KOsO3 samples were characterized by the measurements of magnetic susceptibilities, thermoelectric power, and specific heat. In the talk, we will present the measurement results and the magnetic structure by neutron diffraction.

 

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Publication: [1] Y. Shi, et al. Nature Materials 12, 1024 (2013).
[2] Y. G. et al. Physical Review B 80, 161104 (2009).
[3] S. Calder, et al. Physical Review Letters 108, 257209 (2012).
[4] J. G. Vale, et al. Physical Review Letters 120, 227203 (2018).

Presenters

  • Jie Chen

    Materials Science and Engineering Program, Mechanical Engineering, University of Texas at Austin, Austin, Texas 78712, USA

Authors

  • Jie Chen

    Materials Science and Engineering Program, Mechanical Engineering, University of Texas at Austin, Austin, Texas 78712, USA

  • Hongze Li

    Materials Science and Engineering Program, Mechanical Engineering, University of Texas at Austin, Austin, Texas 78712, USA

  • Jiaming He

    University of Texas at Austin

  • Jianshi Zhou

    University of Texas at Austin