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.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 2011|
|Event||International Conference on Frustration in Condensed Matter, ICFCM - Sendai, Japan|
Duration: 2011 Jan 11 → 2011 Jan 14
ASJC Scopus subject areas
- Physics and Astronomy(all)