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 journalArticle

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 - 2011
Externally publishedYes

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spinel
inelastic scattering
neutron scattering
magnetic permeability
excitation
defects
interactions
temperature
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Stability of hexamer-type spin excitations in the frustrated spinel Mg 1-xCr2O4-x . / Kousaka, Yusuke; Tomiyasu, Keisuke; Yokobori, Toshio; Horigane, Kazumasa; Hiraka, Haruhiro; Yamada, Kazuyoshi; Akimitsu, Jun.

In: Journal of Physics: Conference Series, Vol. 320, 012040, 2011.

Research output: Contribution to journalArticle

Kousaka, Yusuke ; Tomiyasu, Keisuke ; Yokobori, Toshio ; Horigane, Kazumasa ; Hiraka, Haruhiro ; Yamada, Kazuyoshi ; Akimitsu, Jun. / Stability of hexamer-type spin excitations in the frustrated spinel Mg 1-xCr2O4-x . In: Journal of Physics: Conference Series. 2011 ; Vol. 320.
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AU - Hiraka, Haruhiro

AU - Yamada, Kazuyoshi

AU - Akimitsu, Jun

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