Ytterbium-induced impurity states and insulator-metal transition under pressure in Pb1-xGexTe alloysстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:In this paper the temperature dependences of resistivity rho and Hall constant R-H Of Pb1-xGexTe (x less than or equal to 0.04) doped with Yb were investigated both under atmospheric pressure and under hydrostatic compression. It was shown that the rho(1/T) dependences revealed low temperature activation regions of impurity conductivity, indicating the formation of impurity states near the valence band top. Under pressure the slope of the activation regions decreases and insulator-metal transition occurs. On the base of the obtained results a reconstruction diagram of the energy spectrum of Pb1-xGexTe[Yb] under pressure was proposed and the main parameters of the Yb-induced level were estimated.