Low-energy spin excitations in the molecular magnetic cluster V15

G. Chaboussant; R. Basler; A. Sieber; S. T. Ochsenbein; A. Desmedt; R. E. Lechner; M. T. F. Telling; P. Koegerler; A. Mueller; H. -U. Guedel

doi:10.1209/epl/i2002-00240-x

Low-energy spin excitations in the molecular magnetic cluster V15

Strongly Correlated Electrons 2009-11-07 v1

Authors: G. Chaboussant , R. Basler , A. Sieber , S. T. Ochsenbein , A. Desmedt , R. E. Lechner , M. T. F. Telling , P. Koegerler , A. Mueller , H. -U. Guedel

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Abstract

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.

Keywords

inelastic neutron scattering molecular cluster V15 geometric frustration exchange coupling Dzyaloshinskii-Moriya interaction

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@article{arxiv.cond-mat/0204365,
  title  = {Low-energy spin excitations in the molecular magnetic cluster V15},
  author = {G. Chaboussant and R. Basler and A. Sieber and S. T. Ochsenbein and A. Desmedt and R. E. Lechner and M. T. F. Telling and P. Koegerler and A. Mueller and H. -U. Guedel},
  journal= {arXiv preprint arXiv:cond-mat/0204365},
  year   = {2009}
}

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8 pages, 4 figures. to appear in Europhysics Letters

Low-energy spin excitations in the molecular magnetic cluster V15

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