Abstracts 2002

Abstract of Publication No. 422

G. Chaboussant, R. Basler, A. Sieber, S. T. Ochsenbein, A. Desmedt, R. E. Lechner, M. T. F. Telling, P. Kögerler, A. Müller and H. U. Güdel
Low-energy spin excitations in the molecular magnetic cluster V15
Europhys. Lett. 59, 291-297 (2002)      Full Text (PDF)      DOI-Link     

Abstract: We report an Inelastic Neutron Scattering (INS) study of the fully deuterated molecular compound K6[VIV15As6O42]·9D2O (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(2) meV within the triangle and the gap 2D = 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.

Last modified: 13.12.11 by Gabriela Frei