Theory of the conductivity of the pinned Fröhlich charge density wave

Abstract

Recent microscopic calculations that use the concept of the Fröhlich charge-density-wave (CDW) conductivity in the region of a mean-field Peierls transition cannot be applied to discuss the conductivity in ${\mathrm{K}}_2$Pt${\mathrm{}\left(\mathrm{CN}\right)\mathrm{}}_4$ ${\mathrm{Br}}_{0.3}$·3${\mathrm{H}}_2$O (KCP). An approximate formula for the low-temperature CDW conductivity can be derived on the basis of a phenomenological model for the pinning of a CDW. We find that this CDW conductivity contributes only a small fraction to the measured conductivity at low temperatures. Only close to the pinning temperature $T_p\sim 150°$K could this contribution be significant.