Exchange Interactions of the Chromium Spinel Oxide HgCr<sub>2</sub>O<sub>4</sub> in High Magnetic Fields Examined by the Magnetoelastic Theory

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  • Shojiro Kimura
    Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • Masayuki Hagiwara
    Center for Advanced High Magnetic Field Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
  • Tetsuya Takeuchi
    Low Temperature center, Osaka University, Toyonaka, Osaka 560-0043, Japan
  • Hironori Yamaguchi
    Department of Physical Science, Osaka Prefecture University, Sakai 588-8531, Japan
  • Hiroaki Ueda
    Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
  • Koichi Kindo
    Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan

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The chromium spinel oxide HgCr2O4 is known to show a peculiar 1/2-plateau in its magnetization curve. The appearance of the magnetization plateau has been interpreted by classical theories, which take into account the magnetoelastic interaction. In this study, we suggest that not only the magnetization curve but also the change in the exchange interaction, which occurs due to lattice distortions during the magnetization process, can be calculated based on the magnetoelastic theory, proposed by Penc et al. We show that the field dependence of the magnetization and the exchange constants, obtained from our previous experiments, agree well with those calculated by the magnetoelastic theory, except for the behaviors prior to the fully polarized phase. This result indicates that an unexpected phase exists just before the saturation of the magnetization in this compound.

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