Abstract
A contribution to the relaxation rate of a phonon due to an interference term in the perturbation series is evaluated. This term is the product of quartic anharmonic Hamiltonian and defect Hamiltonian. Under certain conditions this contribution is not zero. At high temperatures it is found that the temperature dependence is similar to that of three-phonon processes although the frequency dependence is stronger than that of the three-phonon processes.
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