Comment on 'Interaction of a surface wave with a dislocation'

These are some remarks to the paper of Maurel et al. [Phys. Rev. B 75, 224112 (2007)], which is devoted to deep theoretical analysis of the interaction of acoustic waves (phonons) with dislocations. Taking account of the secondary elastic waves emitted by the vibrating dislocations is an important development of this problem. As a result, the arising dynamic deformation fields are calculated more accurately than before and compared with our experimental results obtained a few years ago for LiNbO3 crystals [Phys. Rev. Lett. 91, 115506 (2003)]. Our objection is related to the usage in the simulations [Phys. Rev. B 75, 224112 (2007)] a very high magnitude (not justified) of the dislocation drag coefficient, which makes problematic a quantitative comparison with our experimental results as well as a part of the conclusions drawn on this basis.