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Applied Physics A

, Volume 74, Supplement 1, pp s929–s931 | Cite as

Intra- and inter-multiplet neutron transitions in an Fe4 magnetic cluster

  • G. Amoretti
  • R. Caciuffo
  • S. Carretta
  • A. Cornia
  • D. Gatteschi
  • J. Kulda
  • E. Liviotti

Abstract.

We report the results of neutron spectroscopy for a tetranuclear iron cluster, Fe4(OCH3)6(dpm)6 (Hdpm = dipivaloylmethane), having an S=5 spin ground state. The experiments were carried out on a deuterated powder sample at ILL, Grenoble. The transitions within the ground multiplet, below 0.3 meV, were measured with a high-resolution time-of-flight spectrometer. Taking into account the presence of three different isomers, the parameters of the zero-field-splitting Hamiltonian have been determined. The results are discussed with reference to high-field electron paramagnetic resonance data. A non-dispersive peak at 7.8 meV, detected at T=1.4 K using a three-axis spectrometer with polarization analysis, is interpreted as the transition between the S=5 ground state and the two degenerate S=4 excited multiplets. The Q dependence of the cross section is discussed in comparison with the theoretical model.

PACS: 75.10.Dg; 75.50.Xx; 78.70.Nx 

Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  • G. Amoretti
    • 1
  • R. Caciuffo
    • 2
  • S. Carretta
    • 1
  • A. Cornia
    • 3
  • D. Gatteschi
    • 4
  • J. Kulda
    • 5
  • E. Liviotti
    • 1
  1. 1.INFM, Dipartimento di Fisica, Università di Parma, Parco Area delle Scienze 7/A, 43 100 Parma, ItalyIT
  2. 2.INFM, Dipartimento di Fisica e Ingegneria dei Materiali, Università di Ancona, Via Brecce Bianche, 60 131 Ancona, ItalyIT
  3. 3.Dipartimento di Chimica, Università di Modena, Via G. Campi 183, 41 100 Modena, ItalyIT
  4. 4.Dipartimento di Chimica, Università di Firenze, Via della Lastruccia 5, 50 019 Sesto Fiorentino (FI), ItalyIT
  5. 5.Institut Laue Langevin, 6 rue J. Horowitz, 38 042 Grenoble, FranceFR

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