| Issue |
Europhys. Lett.
Volume 35, Number 2, July II 1996
|
|
|---|---|---|
| Page(s) | 133 - 138 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1996-00544-3 | |
| Published online | 01 September 2002 | |
Superparamagnetic-like behavior in an octanuclear iron cluster
1
Laboratoire des Champs
Magnétiques Intenses, CNRS, BP 166 Grenoble Cedex 9, France
2
Department of Physics, University of Illinois at Urbana-Champaign, Urbana,
IL 61801-3080, USA
3
Dipartimento di Chimica, Università di Firenze, Via
Maragliano 77, 50144 Firenze, Italy
4
Knox College - Gatesburg, IL 61401, USA
Received:
18
March
1996
Accepted:
29
May
1996
Using high-frequency EPR spectroscopy we have found that a cluster
comprising eight iron(III) ions, 
, which is essentially flat, has a ground
S= 10 state and an Ising-type anisotropy. For the first time both ac
susceptibility and Mössbauer spectroscopy could be used in order to monitor
the relaxation time of the magnetization, which was found to follow a thermally
activated behavior, as in a superparamagnet, with 
and an energy barrier of 22.2 K. The set of data allowed us
to conclude that the origin of the anisotropy in nanosize molecular clusters is
associated with the single ion contributions and not with the shape of the
clusters.
PACS: 76.30.-v – Electron paramagnetic resonance and relaxation / 76.80.+y – Moessbauer effect; other gamma-ray spectroscopy
© EDP Sciences, 1996
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