Displacive structural phase transitions and the magnetic ground state of quadruple perovskite YMn7O12

R. D. Johnson, D. D. Khalyavin, P. Manuel, Y. Katsuya, M. Tanaka, Y. Matsushita, L. Zhang, K. Yamaura, and A. A. Belik
Phys. Rev. B 99, 024107 – Published 16 January 2019

Abstract

We present an experimental study of the structural and magnetic phase transitions of the quadruple perovskite YMn7O12. On cooling below 640 K a displacive structural phase transition occurs, lowering the crystal symmetry from cubic (Im3¯) to monoclinic (I2/m), driven by long range B site Mn3+ orbital order. A second, unconventional structural phase transition takes place on further cooling below 200 K, which is characterized by static atomic displacements (P21/n) as well as a dipolar-glass-like state of yttrium. This low temperature structural transition is driven by the underbonding of yttrium, which is present due to the rigid framework of octahedra tilts unique to the quadruple perovskites that primarily accommodates A site manganese ions. A ground state ferrimagnetic structure was also determined, similar to that found in other RMn7O12 compounds that do not present a low temperature structural phase transition.

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  • Received 12 November 2018

DOI:https://doi.org/10.1103/PhysRevB.99.024107

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

R. D. Johnson1,*, D. D. Khalyavin2, P. Manuel2, Y. Katsuya3, M. Tanaka3, Y. Matsushita4, L. Zhang5,6, K. Yamaura5,6, and A. A. Belik5

  • 1Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, OX1 3PU, United Kingdom
  • 2ISIS facility, Rutherford Appleton Laboratory-STFC, Chilton, Didcot, OX11 0QX, United Kingdom
  • 3Synchrotron X-ray Station at SPring-8, NIMS, Kouto 1-1-1, Sayo-cho, Hyogo 679-5148, Japan
  • 4National Institute for Materials Science (NIMS), Sengen 1-2-1, Tsukuba, Ibaraki 305-0047, Japan
  • 5Research Center for Functional Materials, National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
  • 6Graduate School of Chemical Sciences and Engineering, Hokkaido University, North 10 West 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan

  • *roger.johnson@physics.ox.ac.uk

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Vol. 99, Iss. 2 — 1 January 2019

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