Universal features of the defect-induced damping of lattice vibrations

Details Universal features of the defect-induced damping of lattice vibrations Universal features of the defect-induced damping of lattice vibrations

2006-03-13

arxiv.org/abs/cond-mat/0603343v2

Physics

Condensed Matter

Statistical Mechanics

3 pages, title changed and paper rewritten for improved presentation of the results

Scientific paper

It is shown that any defect gives an Ohmic contribution to the damping of any normal mode of the crystal lattice with nonzero wavevector which does not vanish at zero temperature. This explains the large phason damping observed at low temperatures in incommensurate phases, and might be a key factor to understand the linear-in-$T$ specific heat observed in a number of real dielectrics at low enough temperatures.

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