Far-infrared study of impurity local modes in Ni-doped PbTeстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:In this paper, we present far-infrared reflection spectra of Ni doped PbTe single crystal samples. Crystals of PbTe(Ni) were grown by the Bridgman method. These spectra were analyzed using a fitting procedure based on the modified plasmon-phonon interaction model. Together with the strong plasmon-phonon coupling we obtained three local modes of Ni at about 130, 165 and 190 cm(-1) which correspond to the impurity atoms in different valence states. The positions of these modes depend on impurity center charge, and their intensities depend on temperature and Ni concentration. (C) 2007 Elsevier B.V. All rights reserved.