RAMAN-SCATTERING SPECTRA OF INDIUM-DOPED PBTEстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The non-polarized Raman scattering spectra of indium-doped PbTe single crystals were measured in the temperature range between 10 and 300 K. Well resolved peaks at about 68, 126 and 143 cm(-1) were observed for all temperatures. An additional mode appears at about 115 cm(-1) for temperatures below 100 K. The intensity of this mode increases sharply when the temperature is lowered below 25 K, the temperature where a persistent photoconductivity effect in PbTe(In) appears. This mode is assigned as a local In impurity mode and represents a population of metastable states due to the transfer of electrons from two-electron to one-electron metastable impurity states.