Far-infrared spectroscopy of localized states in indium doped PbTe and Pb(1-x)A(x)Te (A(x)=Mn-0.017; Sn-0.18) alloysстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Far-infrared reflection spectra of indium doped PbTe single crystal as well as of Pb(1-x)A(x)Te alloys (A(x) = Mn-0.017; Sn-0.18) in the temperature range between 10 and 300 K are presented. Analysis of the spectra was made by a fitting procedure based on the model of coupled oscillators. At temperatures below T = 200 K, two additional modes appear, along with the modes which describe strong plasmon-LO phonon coupling. The first mode, at about 122 cm(-1), is a local impurity mode of indium which represents a population of metastable states due to the transfer of electrons from two-electron to one-electron metastable impurity states. The second mode at about 488 cm(-1) we believe to appear as a consequence of the electron transfer from a stable impurity two-electron state to the conduction band.