The proton nuclear spin-lattice relaxation rate 1/T1 in the mol. "ferric wheel" Fe10(OCH3)20(C2H2O2Cl)10 (Fe10) is calcd. 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 |S, M> which differ by 1 both in the quantum no. 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 |S + 1, -(S + 1)> and |S, -S> induced by an applied magnetic field should be accompanied by a strong enhancement of T1-1, in good agreement with recent low-temp. NMR exptl. data on Fe10.
Low-temperature Theory of Proton NMR in the Molecular Antiferromagnetic Ring Fe10 / Cornia, Andrea; A., Fort; M. G., Pini; A., Rettori. - In: EUROPHYSICS LETTERS. - ISSN 0295-5075. - STAMPA. - 50:1(2000), pp. 88-93. [10.1209/epl/i2000-00239-3]
Low-temperature Theory of Proton NMR in the Molecular Antiferromagnetic Ring Fe10
CORNIA, Andrea;
2000
Abstract
The proton nuclear spin-lattice relaxation rate 1/T1 in the mol. "ferric wheel" Fe10(OCH3)20(C2H2O2Cl)10 (Fe10) is calcd. 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 |S, M> which differ by 1 both in the quantum no. 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 |S + 1, -(S + 1)> and |S, -S> induced by an applied magnetic field should be accompanied by a strong enhancement of T1-1, in good agreement with recent low-temp. NMR exptl. data on Fe10.
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