Volume 59, Number 2, July 2002
|Page(s)||291 - 297|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 July 2002|
Low-energy spin excitations in the molecular magnetic cluster
Departement für Chemie und Biochemie,
Universität Bern CH-3000 Bern 9,
2 BENSC, Hahn-Meitner Institut Berlin - D-14109 Berlin, Germany
3 ISIS Facility, Rutherford Appleton Laboratory - Didcot, Oxon 0X11 0QX, UK
4 Ames Laboratory, Iowa State University - Ames, IA50011, USA
5 Fakultät für Chemie, Universität Bielefeld - 33501 Bielefeld, Germany
Corresponding author: email@example.com
Accepted: 17 April 2002
We report an Inelastic Neutron Scattering (INS) study of the fully deuterated molecular compound (). Due to geometrical frustration, the essential physics at low temperatures of the cluster containing 15 coupled (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 meV within the triangle and the gap 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.
PACS: 75.30.Et – Exchange and superexchange interactions / 75.50.Xx – Molecular magnets / 78.70.Nx – Neutron inelastic scattering
© EDP Sciences, 2002
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