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VOLUME 21 (1975) | ISSUE 2 | PAGE 144
"Softening" of phonon spectrum in semiconductors of the Pb1-xSnx Te system on going to the gapless state
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.