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We calculate the temperature dependence of NMR relaxation rate and electricalresistivity for coupling to a local, strongly anharmonic phonon mode. We arguethat the two-phonon Raman process is dominating NMR relaxation. Due to thestrong anharmonicity of the phonon an unusual temperature dependence is foundhaving a low temperature peak and becoming constant towards highertemperatures. The electrical resistivity is found to vary like T^2 at lowtemperatures and following a sqrt{T} behavior at high temperatures. Bothresults are in qualitative agreement with recent observations onbeta-pyrochlore oxide superconductors.

NMR relaxation and resistivity from rattling phonons in pyrochlore superconductors