| Issue |
Europhys. Lett.
Volume 63, Number 5, September 2003
|
|
|---|---|---|
| Page(s) | 764 - 770 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00574-3 | |
| Published online | 01 November 2003 | |
Energy spectrum of the 
molecular magnet
School of Physics, The University of New South Wales - Sydney, NSW 2052, Australia
Received:
24
January
2003
Accepted:
17
June
2003
We present a theoretical analysis of the magnetic energy level
spectrum of the molecular complex
, which is an example of a
“molecular magnet”. Using a Heisenberg exchange model, we
investigate the energy spectrum and the deviations which result
from the slight asymmetry of the cluster. We derive an analytical
expression for the crystal field splitting of the ground state as
a function of the anisotropy. Finally, we establish the existence
of diabolical points in the magnetic-field spectrum and compare
to predictions made by semiclassical and perturbation theory
approaches, and investigate how the location of these points is
affected by higher-order anisotropy terms.
PACS: 75.50.Xx – Molecular magnets / 75.10.Dg – Crystal-field theory and spin Hamiltonians
© EDP Sciences, 2003
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