TY - JOUR
T1 - Stability of hexamer-type spin excitations in the frustrated spinel Mg 1-xCr2O4-x
AU - Kousaka, Yusuke
AU - Tomiyasu, Keisuke
AU - Yokobori, Toshio
AU - Horigane, Kazumasa
AU - Hiraka, Haruhiro
AU - Yamada, Kazuyoshi
AU - Akimitsu, Jun
PY - 2011
Y1 - 2011
N2 - We performed magnetic susceptibility and inelastic neutron scattering measurements on the frustrated spinel Mg1-xCr2O 4-x (0.02 ≤ x ≤ 0.11). Susceptibility shows that Curie-Weiss temperature is almost independent of x, meaning that exchange interactions sustain. Inelastic neutron scattering reveals that the spin-hexamer excitations also persist with almost the same energy around 4 meV in a lowest temperature phase, whereas the resonance width increases with increasing x. These results suggest that nearest-neighboring Cr⋯Cr direct exchange predominantly forms the hexamers regardless of lattice defect and superexchange via Mg and O sites.
AB - We performed magnetic susceptibility and inelastic neutron scattering measurements on the frustrated spinel Mg1-xCr2O 4-x (0.02 ≤ x ≤ 0.11). Susceptibility shows that Curie-Weiss temperature is almost independent of x, meaning that exchange interactions sustain. Inelastic neutron scattering reveals that the spin-hexamer excitations also persist with almost the same energy around 4 meV in a lowest temperature phase, whereas the resonance width increases with increasing x. These results suggest that nearest-neighboring Cr⋯Cr direct exchange predominantly forms the hexamers regardless of lattice defect and superexchange via Mg and O sites.
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U2 - 10.1088/1742-6596/320/1/012040
DO - 10.1088/1742-6596/320/1/012040
M3 - Conference article
AN - SCOPUS:81055133433
SN - 1742-6588
VL - 320
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
M1 - 012040
T2 - International Conference on Frustration in Condensed Matter, ICFCM
Y2 - 11 January 2011 through 14 January 2011
ER -