Volume 35, Number 2, July II 1996
|Page(s)||133 - 138|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Superparamagnetic-like behavior in an octanuclear iron cluster
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
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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