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

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Unquenched geometric frustration effect on spiral spin correlation in magnetically ordered phase'. Together they form a unique fingerprint.

  • Cite this