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We have investigated the temperature (40-295K) dependence of the Raman active phonons of BiCu2PO6 single crystals oriented along a- and b- axis. The comparison between the two orientations did not show any remarkable effect along the b-axis (two-leg zigzag spin ladder direction). At low temperatures the modes appear shifted and narrowed. The spectral characteristics of the modes below ∼60 K show constant values, indicating strong coupling between the formation of spin-ladder and the crystal lattice.
Antonakos et al. (Mon,) studied this question.