Stability of hexamer-type spin excitations in the frustrated spinel Mg 1-xCr2O4-x

Yusuke Kousaka, Keisuke Tomiyasu, Toshio Yokobori, Kazumasa Horigane, Haruhiro Hiraka, Kazuyoshi Yamada, Jun Akimitsu

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number012040
JournalJournal of Physics: Conference Series
Volume320
DOIs
Publication statusPublished - Jan 1 2011
EventInternational Conference on Frustration in Condensed Matter, ICFCM - Sendai, Japan
Duration: Jan 11 2011Jan 14 2011

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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