"Softening" of phonon spectrum in semiconductors of the Pb1-xSnx Te system on going to the gapless state
Nikolaev I.N. , Shotov A.P., Volkov A.F. , Mar'in V.P.
A decrease of about 30% was observed in the Mossbauer-effect probability in the region of the gapless state in narrow-band semiconductors of the Pbj^Sn^Te system. This is attributed to the "softening" of the phonon spectrum as a result of a decrease in the optical-branch frequencies, and points to a strong electron-phonon interaction.