Volume 60, Number 2, October 2002
|Page(s)||302 - 308|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 October 2002|
Quantum tunneling in molecular ferric wheels
Physikalisches Institut III, Universität Erlangen-Nürnberg D-91058 Erlangen, Germany
Accepted: 5 August 2002
An effective spin Hamiltonian is presented which describes the low-lying energy spectrum of antiferromagnetic molecular rings with high accuracy. It will be shown that for the particular case of the ferric wheels, quantum coherent phenomena are best discussed in terms of resonant quantum tunneling of the spin vector between different rotational modes. These quantum processes are associated to anticrossings of higher-lying spin multiplets with .
PACS: 75.10.Jm – Quantized spin models / 75.50.Xx – Molecular magnets / 73.40.Gk – Tunneling
© EDP Sciences, 2002
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