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

doi:10.1143/JPSJ.76.043708

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 journal › Article › peer-review

20 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, T_N ≃ 6 K, 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.

Original language	English
Article number	043708
Journal	journal of the physical society of japan
Volume	76
Issue number	4
DOIs	https://doi.org/10.1143/JPSJ.76.043708
Publication status	Published - 2007 Apr
Externally published	Yes

Keywords

Geometric frustration
HgCr O
High magnetic field
X-ray diffraction

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.76.043708

Cite this

Tanaka, Y., Narumi, Y., Terada, N., Katsumata, K., Ueda, H., Staub, U., Kindo, K., Fukui, T., Yamamoto, T., Kammuri, R., Hagiwara, M., Kikkawa, A., Ueda, Y., Toyokawa, H., Ishikawa, T., & Kitamura, H. (2007). Lattice deformations induced by an applied magnetic field in the frustrated antiferromagnet HgCr₂O₄. journal of the physical society of japan, 76(4), [043708]. https://doi.org/10.1143/JPSJ.76.043708

Tanaka, Y, Narumi, Y, Terada, N, Katsumata, K, Ueda, H, Staub, U, Kindo, K, Fukui, T, Yamamoto, T, Kammuri, R, Hagiwara, M, Kikkawa, A, Ueda, Y, Toyokawa, H, Ishikawa, T & Kitamura, H 2007, 'Lattice deformations induced by an applied magnetic field in the frustrated antiferromagnet HgCr₂O₄', journal of the physical society of japan, vol. 76, no. 4, 043708. https://doi.org/10.1143/JPSJ.76.043708

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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.",

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AU - Tanaka, Yoshikazu

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AU - Terada, Noriki

AU - Katsumata, Koichi

AU - Ueda, Hiroaki

AU - Staub, Urs

AU - Kindo, Koichi

AU - Fukui, Tomoya

AU - Yamamoto, Tomohide

AU - Kammuri, Ryotaro

AU - Hagiwara, Masayuki

AU - Kikkawa, Akiko

AU - Ueda, Yutaka

AU - Toyokawa, Hidenori

AU - Ishikawa, Tetsuya

AU - Kitamura, Hideo

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AB - 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.

KW - Geometric frustration

KW - HgCr O

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KW - X-ray diffraction

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