Molecular Spin Resonance in the Geometrically Frustrated Magnet MgCr(2)O(4) by Inelastic Neutron Scattering

摘要: We measured two magnetic modes with finite and discrete energies in an antiferromagnetic ordered phase of a geometrically frustrated magnet ${\mathrm{MgCr}}_{2}{\mathrm{O}}_{4}$ by single-crystal inelastic neutron scattering, clarified the spatial spin correlations levels: one is hexamer other heptamer. Since these correlation types are emblematic quasielastic scattering geometric frustration, our results indicate instantaneous suppression lattice distortion spin-lattice coupling, probably also supported orbital charge. The common features levels, intermolecular independence discreteness energy, suggest that molecules interpreted as quasiparticles (elementary excitations energy quantum) highly spins, analogy Fermi liquid approximation.