Molecular Quantum Magnetism in LiZn sub(2)Mo sub(3)O sub(8 )

Molecular Quantum Magnetism in LiZn sub(2)Mo sub(3)O sub(8 )

Inelastic neutron scattering at low temperatures T [< or =] 30 from a powder of LiZn sub(2)Mo sub(3)O sub(8 ) demonstrates this triangular-lattice antiferromagnet hosts collective magnetic excitations from spin-1/2 Mo sub(3)O sub(13) molecules. Apparently gapless ( delta < 0.2 meV) and extendi...

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Veröffentlicht in:Physical review letters 2014-01, Vol.112 (2)
Hauptverfasser: Mourigal, M, Fuhrman, W T, Sheckelton, J P, Wartelle, A, Rodriguez-Rivera, J A, Abernathy, D L, McQueen, T M, Broholm, C L
Format: Artikel
Sprache:eng
Schlagworte:
Antiferromagnetism
Compatibility
Cross sections
Dispersion (wave)
Dynamics
Forming
Magnetism
Neutron scattering
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Zusammenfassung:Inelastic neutron scattering at low temperatures T [< or =] 30 from a powder of LiZn sub(2)Mo sub(3)O sub(8 ) demonstrates this triangular-lattice antiferromagnet hosts collective magnetic excitations from spin-1/2 Mo sub(3)O sub(13) molecules. Apparently gapless ( delta < 0.2 meV) and extending at least up to 2.5 meV, the low-energy magnetic scattering cross section is surprisingly broad in momentum space and involves one-third of the spins present above 100 K. The data are compatible with the presence of valence bonds involving nearest-neighbor and next-nearest-neighbor spins forming a disordered or dynamic state.
ISSN:0031-9007
1079-7114