Molecular spin resonance in the geometrically frustrated magnet MgCr2O4 by inelastic neutron scattering

K. Tomiyasu, H. Suzuki, M. Toki, S. Itoh, M. Matsuura, N. Aso, K. Yamada

研究成果: Article査読

59 被引用数 (Scopus)

抄録

We measured two magnetic modes with finite and discrete energies in an antiferromagnetic ordered phase of a geometrically frustrated magnet MgCr2O4 by single-crystal inelastic neutron scattering, and clarified the spatial spin correlations of the two levels: one is an antiferromagnetic hexamer and the other is an antiferromagnetic heptamer. Since these correlation types are emblematic of quasielastic scattering with geometric frustration, our results indicate instantaneous suppression of lattice distortion in an ordered phase by spin-lattice coupling, probably also supported by orbital and charge. The common features in the two levels, intermolecular independence and discreteness of energy, suggest that the spin molecules are interpreted as quasiparticles (elementary excitations with energy quantum) of highly frustrated spins, in analogy with the Fermi liquid approximation.

本文言語English
論文番号177401
ジャーナルPhysical Review Letters
101
17
DOI
出版ステータスPublished - 2008 10月 20

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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