We study the phonon-induced relaxation dynamics in the heterometallic Cr7 Ni ring. By assuming that spin-phonon coupling occurs through the modulation of local crystal fields, we investigate the decay of time correlations of molecular observables, such as fluctuations of the cluster magnetization. Single-crystal H1 nuclear magnetic resonance measurements have been performed for two orthogonal orientations of the applied magnetic field. The nuclear spin-lattice relaxation rate 1/ T1 probes fluctuations of specific molecular observables, thus allowing to determine the magnetoelastic coupling strength and to calculate the magnetization relaxation time as well as phonon-induced level lifetimes. The knowledge of these time scales is crucial to control the spin dynamics of the magnetic cluster in view of the potential technological applications.
Phonon-induced relaxation in the Cr7Ni magnetic molecule probed by NMR / A. Bianchi, S. Carretta, P. Santini, G. Amoretti, J. Lago, M. Corti, A. Lascialfari, P. Arosio, G. Timco, R.E.P. Winpenny,. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 82:13(2010), p. 134403.134403. [10.1103/PhysRevB.82.134403]
Phonon-induced relaxation in the Cr7Ni magnetic molecule probed by NMR
A. Lascialfari;P. Arosio;
2010
Abstract
We study the phonon-induced relaxation dynamics in the heterometallic Cr7 Ni ring. By assuming that spin-phonon coupling occurs through the modulation of local crystal fields, we investigate the decay of time correlations of molecular observables, such as fluctuations of the cluster magnetization. Single-crystal H1 nuclear magnetic resonance measurements have been performed for two orthogonal orientations of the applied magnetic field. The nuclear spin-lattice relaxation rate 1/ T1 probes fluctuations of specific molecular observables, thus allowing to determine the magnetoelastic coupling strength and to calculate the magnetization relaxation time as well as phonon-induced level lifetimes. The knowledge of these time scales is crucial to control the spin dynamics of the magnetic cluster in view of the potential technological applications.Pubblicazioni consigliate
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