TY - JOUR
T1 - Molecular spin-liquid state in the spin-32 frustrated spinel HgCr 2O4
AU - Tomiyasu, K.
AU - Ueda, H.
AU - Matsuda, M.
AU - Yokoyama, M.
AU - Iwasa, K.
AU - Yamada, K.
PY - 2011/7/11
Y1 - 2011/7/11
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.84.035115
DO - 10.1103/PhysRevB.84.035115
M3 - Article
AN - SCOPUS:79961216516
VL - 84
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 3
M1 - 035115
ER -