It is shown that phonon-dislocation scattering does not contribute significantly to equilibrating the phonon system for potassium. The implications of this result are discussed for the phonon-drag contribution to the low-temperature electrical resistivity.
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Acknowledgements — We thank H. van Kempen and his colleagues at the Catholic University of Nijmegen for a fruitful correspondence about the details of the experi- ment We also thank J.A. Rowlands for useful correspondence and D. Gugan for an enlightening discussion dislocation densities in potassium. Finally, we gratefully acknowledge the financial support provided by the Israel Commission for Basic Research.