| Numéro |
J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988
Proceedings of the International Conference on Magnetism
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|---|---|---|
| Page(s) | C8-1517 - C8-1518 | |
| DOI | https://doi.org/10.1051/jphyscol:19888699 | |
Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-1517-C8-1518
DOI: 10.1051/jphyscol:19888699
1 Kamerlingh Onnes Laboratorium der Rijksuniversiteit Leiden, Postbus 9506, 2300 RA Leiden, The Netherlands
2 Departamento de Fisica, Universidade Federal de Pernambuco, 50739 Recife, Brasil.
3 Institut für Anorganische Chemie, Universität Essen, Universitätsstrasse 5-7, 4300 Essen 1, F.R.G.
J. Phys. Colloques 49 (1988) C8-1517-C8-1518
DOI: 10.1051/jphyscol:19888699
MAGNETIC MEASUREMENTS ON THE HIGH-NUCLEARITY COBALT COMPOUND Co55[P(CH3)3]12Cl20
J. Albino O. de Aguiar1, 2, M. J. G. M. Jurgens1, G. Schmidt3 et L. J. de Jongh11 Kamerlingh Onnes Laboratorium der Rijksuniversiteit Leiden, Postbus 9506, 2300 RA Leiden, The Netherlands
2 Departamento de Fisica, Universidade Federal de Pernambuco, 50739 Recife, Brasil.
3 Institut für Anorganische Chemie, Universität Essen, Universitätsstrasse 5-7, 4300 Essen 1, F.R.G.
Abstract
We present the frequency- and magnetic field dependence of the ac-susceptibility on the polynuclear metal cluster compound Co55[P(CH3)3]12Cl20 at helium temperatures (1.05 K < T < 4.2 K). Relaxation effects, characteristic of superparamagnetic particles, which are observed in the absence of an applied dc magnetic field become suppressed in low fields of 0.1 tesla. The frequency dependence of the ac-susceptibility shows features ascribable to intra- and intercluster relaxation effects.