Peculiarities of low-frequency excitation spectrum of CsDy1−xBix(MoO4)2

Abstract

Low-frequency IR transmission spectra for a series of isostructural single crystals of CsDy1−xBix(MoO4)2 (x=0, 0.05, 0.1, 0.2, 0.3, 0.5, and 0.7) are measured at low temperatures (T≃6 K). It is found experimentally that absorption band broadening takes place in the Bi concentration range 0.2⩽x⩽0.6. The mechanism which may result in absorption spectrum blurring are considered.