FIR-magnetospectroscopy has been performed on nano-scale molecular magnets to study their spin Hamiltonian parameters and symmetries. The first case is the characterization of high spin molecule Mn/sub 11/Crac[Mn/sub 11/Cr(O/sub 2/CCH/sub 3/)/sub 16/(H/sub 2/O)/sub 4/]/spl middot/4H/sub 2/O)] with ferromagnetic ground state, which is made by Cr doping into the most famous ferromagnetic cluster Mn/sub 12/ac with S=10 ground state. We found that Mn/sub 11/Crac is the spin-odd cluster(S=19/2) and that the anisotropy parameter is nearly identical to that of Mn/sub 12/ac. A comparative study of those clusters is very useful to explore spin parity effect in quantum tunnelling. As the second example, we investigate a four-spin-ring with singlet ground state. We observed forbidden transitions between the ground state and the excited states, which uncovers the nature of the tunnelling gaps caused by the mixing among the quantized levels.


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    Titel :

    FIR-magnetospectroscopy on molecular magnets


    Beteiligte:
    Nojiri, H. (Autor:in) / Hachisuka, H. (Autor:in) / Awaga, K. (Autor:in) / Kogerler, P. (Autor:in) / Luban, M. (Autor:in) / Barra, A.L. (Autor:in)


    Erscheinungsdatum :

    01.01.2004


    Format / Umfang :

    201767 byte




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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