Unquenched geometric frustration effect on spiral spin correlation in magnetically ordered phase

Keisuke Tomiyasu, Kazumasa Horigane, Toshio Yokobori, Yusuke Kousaka, Miwako Takahashi, Haruhiro Hiraka, Jun Akimitsu, Kazuyoshi Yamada

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We studied magnetic phase diagram and x-dependence of spiral spin correlation in magnetically ordered phase of (Co 1-xZn x)Cr 2O 4 by magnetization and neutron scattering experiments. The spiral correlation survives in a wide × range from 0 to 0.9. As × increases, the correlation length decreases from ξ ∼ 23 Å at × - 0, and saturates at ξ ∼ 2:5 Å at around × - 0:75, which is close to the nearest neighboring Cr 3+-Cr 3+ distance. The pitch is almost constant from × - 0 to 0.75, then abruptly shortens above around × - 0:75. The correlation is isotropic at × = 0:25 but anisotropic at × = 0:75. We discuss that the spiral correlation is of short-range owing to unquenched geometric frustration, and begins to collapse with the minimization of correlation length above around × - 0:75, possibly as the precursor of dynamic spin hexamer caused by high geometric frustration.

Original languageEnglish
Article number084704
JournalJournal of the Physical Society of Japan
Volume78
Issue number8
DOIs
Publication statusPublished - Aug 2009
Externally publishedYes

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frustration
spin dynamics
neutron scattering
phase diagrams
magnetization
optimization
scattering

Keywords

  • CoCr O
  • Diffuse scattering
  • Geometric frustration
  • Hexamer
  • Neutron
  • Spin molecule
  • Spiral
  • ZnCr O

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Unquenched geometric frustration effect on spiral spin correlation in magnetically ordered phase. / Tomiyasu, Keisuke; Horigane, Kazumasa; Yokobori, Toshio; Kousaka, Yusuke; Takahashi, Miwako; Hiraka, Haruhiro; Akimitsu, Jun; Yamada, Kazuyoshi.

In: Journal of the Physical Society of Japan, Vol. 78, No. 8, 084704, 08.2009.

Research output: Contribution to journalArticle

Tomiyasu, Keisuke ; Horigane, Kazumasa ; Yokobori, Toshio ; Kousaka, Yusuke ; Takahashi, Miwako ; Hiraka, Haruhiro ; Akimitsu, Jun ; Yamada, Kazuyoshi. / Unquenched geometric frustration effect on spiral spin correlation in magnetically ordered phase. In: Journal of the Physical Society of Japan. 2009 ; Vol. 78, No. 8.
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AU - Takahashi, Miwako

AU - Hiraka, Haruhiro

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AB - We studied magnetic phase diagram and x-dependence of spiral spin correlation in magnetically ordered phase of (Co 1-xZn x)Cr 2O 4 by magnetization and neutron scattering experiments. The spiral correlation survives in a wide × range from 0 to 0.9. As × increases, the correlation length decreases from ξ ∼ 23 Å at × - 0, and saturates at ξ ∼ 2:5 Å at around × - 0:75, which is close to the nearest neighboring Cr 3+-Cr 3+ distance. The pitch is almost constant from × - 0 to 0.75, then abruptly shortens above around × - 0:75. The correlation is isotropic at × = 0:25 but anisotropic at × = 0:75. We discuss that the spiral correlation is of short-range owing to unquenched geometric frustration, and begins to collapse with the minimization of correlation length above around × - 0:75, possibly as the precursor of dynamic spin hexamer caused by high geometric frustration.

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