Two-phonon spin-lattice relaxation of rigid atomic clusters

Abstract

Spin-phonon relaxation due to two-phonon processes of a spin cluster embedded in an elastic medium has been studied. For the case of uniaxial anisotropy, relaxation rates due to Raman processes and processes involving the emission of two phonons have been obtained. For a biaxial spin Hamiltonian, the rates of transitions between tunnel-split levels have been computed. By comparison with the rates of corresponding direct processes, we have established temperature ranges where the Raman mechanism dominates over the one-phonon decay mechanism.

arXiv comment9 PR pages, 3 figures

References in corpus (4)

• Universal mechanism of spin relaxation in solids
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• Characterization of the S = 9 excited state in Fe8Br8 by Electron Paramagnetic Resonance
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• Density Matrix Equation for a Bathed Small System and its Application to Molecular Magnets
• Transition rates for a S \ge 1 model coupled to a phonon bath