Proton NMR for measuring quantum level crossing in the magnetic molecular ring Fe-10

Authors
Julien, MH Jang, ZH Lascialfari, A Borsa, F Horvatic, M Caneschi, A Gatteschi, D
Citation
Mh. Julien et al., Proton NMR for measuring quantum level crossing in the magnetic molecular ring Fe-10, PHYS REV L, 83(1), 1999, pp. 227-230
Citations number
26
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
83
Issue
1
Year of publication
1999
Pages
227 - 230
Database
ISI
SICI code
0031-9007(19990705)83:1<227:PNFMQL>2.0.ZU;2-P
Abstract
The proton nuclear spin-lattice relaxation rate 1/T-1 has been measured as a function of temperature and magnetic field (up to 15 T) in the molecular magnetic ring Fe-10(OCH3)(20)(O2CCH2Cl)(10) (Fe10). Striking enhancement of 1/T-1 is observed around magnetic field values corresponding to a crossing between the ground state and the excited states of the molecule. We propos e 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 effe ct provides a powerful tool to investigate quantum dynamical phenomena at l evel crossing.