Far infrared study of local impurity modes of Gd doped PbTe

• Published in: Materials chemistry and physics Vol. 112; no. 2; pp. 496 - 499
• Main Authors: Nikolic, P.M., Paraskevopoulos, K.M., Vujatovic, S.S., Nikolic, M.V., Bojicic, A., Zorba, T.T., Stamenovic, B., Blagojevic, V., Jovic, M., Dasic, M., König, W.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-12-2008
• Subjects: Far infrared reflectivity; Rare earth impurity; Semiconductors; Semiconductors; Far infrared reflectivity; Rare earth impurity
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/j.matchemphys.2008.05.083

Single crystal samples of lead telluride doped with Gd were grown using the Bridgman method. Far infrared reflectivity spectra in the temperature range from 10
K to 300
K were measured. The experimental diagrams were numerically analyzed using a fitting procedure based on the plasma–phonon interaction model and the optical parameters were determined, while two local modes of gadolinium were observed at about 155
cm
−1 and 230
cm
−1 at room temperature. The origin of these local vibrational impurity modes was discussed.