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

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number177401
JournalPhysical Review Letters
Volume101
Issue number17
DOIs
Publication statusPublished - 2008 Oct 20

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint

Dive into the research topics of 'Molecular spin resonance in the geometrically frustrated magnet MgCr2O4 by inelastic neutron scattering'. Together they form a unique fingerprint.

Cite this