Low-energy spin excitations in the molecular magnetic cluster V15

Details Low-energy spin excitations in the molecular magnetic cluster V15 Low-energy spin excitations in the molecular magnetic cluster V15

2002-04-17

arxiv.org/abs/cond-mat/0204365v1

Europhysics Letters, vol 59, 291 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 4 figures. to appear in Europhysics Letters

Scientific paper

10.1209/epl/i2002-00240-x

We report an Inelastic Neutron Scattering (INS) study of the fully deuterated molecular compound K6[V15As6O42].9(D2O) (V15). Due to geometrical frustration, the essential physics at low temperatures of the V15 cluster containing 15 coupled V4+ (S=1/2) is determined by three weakly coupled spin-1/2 on a triangle. The INS spectra at low-energy allow us to directly determine the effective exchange coupling J0 = 0.211 meV within the triangle and the gap 2 \Delta = 0.035(2)meV between the two spin-1/2 doublets of the ground state. Results are discussed in terms of deviations from trigonal symmetry and Dzyaloshinskii-Moriya (DM) interactions.

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