Lattice deformations induced by an applied magnetic field in the frustrated antiferromagnet HgCr2O4

Yoshikazu Tanaka, Yasuo Narumi, Noriki Terada, Koichi Katsumata, Hiroaki Ueda, Urs Staub, Koichi Kindo, Tomoya Fukui, Tomohide Yamamoto, Ryotaro Kammuri, Masayuki Hagiwara, Akiko Kikkawa, Yutaka Ueda, Hidenori Toyokawa, Tetsuya Ishikawa, Hideo Kitamura

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

The way geometric frustration in the pyrochlore antiferromagnet HgCr 2O4 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, TN ≃ 6 K, to relieve the geometrical frustration. Below TN, 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.

Original languageEnglish
Article number043708
Journaljournal of the physical society of japan
Volume76
Issue number4
DOIs
Publication statusPublished - 2007 Apr

Keywords

  • Geometric frustration
  • HgCr O
  • High magnetic field
  • X-ray diffraction

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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