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

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

2011-04-12

arxiv.org/abs/1104.2163v1

Phys. Rev. B 84, 035115 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 2 figures

Scientific paper

10.1103/PhysRevB.84.035115

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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