Volume 50, Number 1, April I 2000
|Page(s)||88 - 93|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 September 2002|
Low-temperature theory of proton NMR in the molecular antiferromagnetic ring Fe10
Dipartimento di Chimica, Università di Modena e
Via G. Campi 183, I-41100 Modena, Italy
2 Istituto di Elettronica Quantistica, Consiglio Nazionale delle Ricerche Via Panciatichi 56/30, I-50127 Firenze, Italy
3 Dipartimento di Fisica, Università di Firenze and Istituto Nazionale di Fisica della Materia, Unità di Firenze - Largo Enrico Fermi 2, I-50125 Firenze, Italy
Accepted: 26 January 2000
The proton nuclear spin-lattice relaxation rate in the molecular “ferric wheel” (Fe10) is calculated in the framework of the linear response theory, starting from the unperturbed eigenvalues and eigenstates of the magnetic ring. The dipole-dipole superhyperfine interaction between the proton nuclear spins and the electronic spins of the magnetic ions is shown to induce transitions between states which differ by 1 both in the quantum number S (the total spin of the ring) and in M (the projection of the total spin along the quantization axis). The theory predicts that level crossing between the states and induced by an applied magnetic field should be accompanied by a strong enhancement of , in good agreement with recent low-temperature NMR experimental data on Fe10.
PACS: 75.50.Xx – Molecular magnets / 76.60.-k – Nuclear magnetic resonance and relaxation / 75.10.Jm – Quantized spin models
© EDP Sciences, 2000
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