Molecular spin-liquid state in the spin-32 frustrated spinel HgCr 2O4

K. Tomiyasu, H. Ueda, M. Matsuda, M. Yokoyama, K. Iwasa, K. Yamada

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


A hexamer-type spin excitation seen in spinel chromates ACr 2O4 (A=Mg, Zn, or Cd) is the representative spin-liquid-like state caused by geometrical frustration. To clarify an origin of the state, we comparatively studied spin excitations in an isomorphic material HgCr2O4 by inelastic neutron scattering and observed a different molecular-type excitation. Numerical analyses performed using model Hamiltonians suggest that these two types of spin excitations originate from a spin-3/2 molecular singlet hidden in a magnetically ordered phase. The difference between the molecular types is explained by the difference in the kind of exchange interactions occurring in the chromates.

Original languageEnglish
Article number035115
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number3
Publication statusPublished - 2011 Jul 11

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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