Volume 43, Number 1, July I 1998
|Page(s)||7 - 12|
|Section||Atomic, molecular and optical physics|
|Published online||01 September 2002|
Magnetic properties of a new spin cluster topology with high-spin ground state: the spin cluster
Physikalisches Institut, Universität Karlsruhe
(TH) - D-76128 Karlsruhe, Germany
2 Institut für Anorganische Chemie, Universität Karlsruhe (TH) D-76128 Karlsruhe, Germany
3 Grenoble High Magnetic Field Laboratory, 25, Avenue des Martyrs, BP 166, F-38042 Grenoble, Cedex 9, France
Accepted: 14 May 1998
The new spin cluster realizes a topological structure of mixed-valence manganese clusters which is especially favorable for a high-spin ground state. The magnetic properties of the spin cluster are studied numerically by exact diagonalization of the spin Hamiltonian. By magnetic susceptibility two exchange constants are found: and , which lead to a S=11 high-spin ground state. Electron spin resonance (ESR) measurements at three frequencies 95, 190 and 285 GHz confirm the large spin of the ground state and reveal an Ising anisotropy of the ground state which is characterized by the spin Hamiltonian with and . Ac-susceptibility shows thermally activated relaxation of the magnetization for temperatures above with an activation energy of and a relaxation time of .
PACS: 31.70.Ks – Molecular solids / 33.35.+r – Electron resonance and relaxation / 36.40.-c – Atomic and molecular clusters
© EDP Sciences, 1998
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