Magnetic properties of the cyclic spincluster Fe6:bicine |
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| Authors: | B. Pilawa I. Keilhauer G. Fischer S. Knorr J. Rahmer A. Grupp |
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| Affiliation: | 1.Physikalisches Institut, Universit?:t Karlsruhe (TH), Wolfgang Gaede Strasse 1, 76128 Karlsruhe, Germany,DE;2.2. Physikalisches Institut, Universit?t Stuttgart, 70550 Stuttgart, Germany,DE |
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| Abstract: | The magnetic properties of the cyclic compound [Fe6(bicine)6] LiClO4 . 2MeOH are reported. The cluster Fe6(bicine)6 forms an antiferromagnetically coupled ring structure of Fe III ions. The magnetic susceptibility is measured between 2 and 300 K and yields the exchange coupling of J/k B = - 27.5±0.5 K. The field dependence of the magnetic moment is studied at 3 and 6 K in magnetic fields up to 5 T. The zero-field splitting of the first excited spin states with S = 2 and 3 are determined by ESR at 94 GHz. The intra-molecular interactions of the Fe III ions are analyzed and the on-site anisotropy of the Fe III due to the ligand-configuration is determined to d /k B = - 0.633±0.008K. Received 28 October 2002 / Received in final form 22 February 2003 Published online 20 June 2003 RID="a" ID="a"e-mail: bernd@piobelix.physik.uni-karlsruhe.de |
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| Keywords: | PACS. 33.35.+r Electron resonance and relaxation – 36.40.-c Atomic and molecular clusters – 75.20.-g Diamagnetism, paramagnetism, and superparamagnetism – 75.75.+a Magnetic properties of nanostructures |
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