Open AccessFAR INFRARED SPECTRAL STUDY OF THE PHONON STATES OF THE MIXED CRYSTALS CdxHg1-x Te
Author(s) -
Xuechu Shen,
Chu Jun-Hao
Publication year - 1984
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.33.729
Subject(s) - materials science , phonon , infrared , absorption (acoustics) , infrared spectroscopy , doping , ab initio , spectral line , wavenumber , planar , absorption band , molecular physics , absorption spectroscopy , far infrared , condensed matter physics , optics , optoelectronics , chemistry , physics , computer graphics (images) , computer science , organic chemistry , astronomy , composite material
The far infrared absorption spectra measurements were performed on the CdxHg1-x Te samples with x=0.18 to 0.45 in the wavenumber region of 15-500 cm-1 at the temperatures from 4.5 to 300 K. In addition to the absorption structures of two phonon combination on both sides of the reststrahlen band of the material, a low frequency absorption band has been observed for the first time between 20-50 cm-1 in all the measured samples. By comparison with the phonon spectra of the mixed crystals CdxHg1-x Te which have been estimated by means of the ab initio density functional calculations of planar force constants, we have attributed the low frequency absorption band to the TA band modes induced by the disorder and "doping" effects resulting from by the crystalline mixing in the material.