Lattice Deformations Induced by an Applied Magnetic Field in the Frustrated Antiferromagnet HgCr_2O_4

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Author(s)

Abstract

The way geometric frustration in the pyrochlore antiferromagnet HgCr_2O_4 is relieved by an applied magnetic field is studied by synchrotron X-ray diffraction. The material shows a structural change, from cubic to orthorhombic, at the magnetic transition temperature, T_N[〜!-]6K, to relieve the geometrical frustration. Below T_N, successive magnetic phase transitions occur in an applied field, from the antiferromagnetic to the half-magnetization plateau phase followed by a transition with a kink in the magnetization. We find that the lattice constant shows discontinuous expansions that coincide with magnetization changes, indicating progressive relief of geometric frustration. We calculate the lattice deformation invoking a magneto-elastic coupling and obtain good agreement between the calculation and our observation.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 76(4), "43708-1"-"43708-4", 2007-04-15

    The Physical Society of Japan (JPS)

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Codes

  • NII Article ID (NAID)
    110006278033
  • NII NACSIS-CAT ID (NCID)
    AA00704814
  • Text Lang
    ENG
  • Article Type
    SHO
  • ISSN
    00319015
  • NDL Article ID
    8705818
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z53-A404
  • Data Source
    CJP  NDL  NII-ELS 
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