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Molecular spin-liquid state in spin-3/2 frustrated spinel HgCr$_2$O$_4$

Authors
  • Tomiyasu, K.
  • Ueda, H.
  • Matsuda, M.
  • Yokoyama, M.
  • Iwasa, K.
  • Yamada, K.
Type
Published Article
Publication Date
Apr 12, 2011
Submission Date
Apr 12, 2011
Identifiers
DOI: 10.1103/PhysRevB.84.035115
Source
arXiv
License
Yellow
External links

Abstract

A hexamer-type spin excitation seen in spinel chromates $A$Cr$_2$O$_4$ ($A$ = 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 HgCr$_2$O$_4$ 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.

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