The optical and vibrational properties of the chalcopyrite CdGeP2

다국어 초록 (Multilingual Abstract)

We grew CdGeP2 single crystals by using the horizontal Bridgman method. The oscillating
transmission spectra of polarized light at various sample temperatures and the Raman shift as
function of pressure were observed, and the dierence in the refractive index near energy band gap
and the Biot dispersion of CdGeP2 as functions of temperature were determined. In the temperature
range between room temperature and near 100 K, in which the thermal expansion eect is dominant,
the temperature coecient of the optical energy band gap is given by dEg;op=dT = က4:95 10က4
eV/K. The Biot dispersion varied linearly within the temperature in the range between 100 K
and 250 K, and the linear coecient of the Biot dispersion in that temperature range was about
1:6110က5 radm. We measured the Raman shift under pressure. The linear pressure coecient of
the Raman modes in CdGeP2 could be divided roughly into three groups according to its magnitude.