| Issue |
Europhys. Lett.
Volume 43, Number 1, July I 1998
|
|
|---|---|---|
| Page(s) | 7 - 12 | |
| Section | Atomic, molecular and optical physics | |
| DOI | https://doi.org/10.1209/epl/i1998-00310-1 | |
| Published online | 01 September 2002 | |
Magnetic properties of a new spin cluster topology with high-spin
ground state:
the spin cluster 
1
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
Received:
9
March
1998
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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