On a biphononic origin of the 1125 cm^(-1) absorption band in cuprous oxide
arXiv:cond-mat/9812122 · doi:10.1016/S0375-9601(99)00052-3
Abstract
We report on the IR spectroscopic studies in both reflection (50-900 cm^{-1}) and transmission (900-3000 cm^{-1}) mode of the vibration spectrum of the cuprous oxide. A detailed analysis based on a comparison of the temperature dependences of the absorption band at 1125 cm^{-1} and of IR and Raman active fundamental vibrations results in assignment of the former to a biphonon.
5 pages, 5 figures (to appear in Phys.Lett. A)