Phys. Rev. Lett. 83, 227 - 230 (1999)Proton NMR for Measuring Quantum Level Crossing in the Magnetic Molecular Ring Fe10 |
M.-H. Julien1,2, Z. H. Jang1, A. Lascialfari2, F. Borsa1,2, M. Horvatić3, A. Caneschi4, and D. Gatteschi4
1Department of Physics and Astronomy, Ames Laboratory, Iowa State University, Ames, Iowa 50011
2Dipartimento di Fisica “A. Volta” e Unitá INFM di Pavia, Via Bassi 6, 27100 Pavia, Italy
3Grenoble High Magnetic Field Laboratory, CNRS and MPI-FKF, BP 166, 38042 Grenoble Cedex 9, France
4Department of Chemistry, University of Firenze, Via Maragliano 77, 50144 Firenze, Italy
Received 5 March 1999
The proton nuclear spin-lattice relaxation rate 1/T1 has been measured as a function of temperature and magnetic field (up to 15 T) in the molecular magnetic ring Fe10(OCH3)20(O2CCH2Cl)10 (Fe10). Striking enhancement of 1/T1 is observed around magnetic field values corresponding to a crossing between the ground state and the excited states of the molecule. We propose that this is due to a cross-relaxation effect between the nuclear Zeeman reservoir and the reservoir of the Zeeman levels of the molecule. This effect provides a powerful tool to investigate quantum dynamical phenomena at level crossing.
©1999 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v83/p227
DOI: 10.1103/PhysRevLett.83.227
PACS: 76.60.-k, 75.50.Xx
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