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Peculiarities of the Far-Infrared Reflection Spectra of the Doped Lead-Tin Tellurides Revealing the Persistent Photoconductivity Effect

Published online by Cambridge University Press:  25 February 2011

Aleksander I. Belogorokhov
Affiliation:
Institute of Rare Metals, Moscow, USSR
Ivan I. Ivanchik
Affiliation:
Physics Department, Moscow State University, Moscow 119899, USSR
Dmitriy R. Khokhlov
Affiliation:
Physics Department, Moscow State University, Moscow 119899, USSR
Zoran V. Popovich
Affiliation:
Institute of Physics, P.O.Box 57, 11001 Belgrade, Yugoslavia
Nebojsha Romchevich
Affiliation:
Institute of Physics, P.O.Box 57, 11001 Belgrade, Yugoslavia
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Abstract

We measured the far-infrared reflectivity spectra of PbTe(Ga) and Pb1−xSnxTe(In) - materials revealing the Persistent Photoconductivity effect at the low temperatures T<Tc; Tc≈80K and 25K, respectively-The reflectivity spectra display the singuliarity nearby the plasmon-phonon minimum. The spectra may be fitted satisfactory by means of the introduction of an additional oscillator into the dispersion relation. The result is interpreted in the framework of the model taking into account the temperature change of the one-electron metastable impurity state Position in the configuration-coordinate space. The oscillator corresponds to the two-electron - one-electron state transitions. Some previously unexplained results find the satisfactory interpretation in the framework of the model Proposed.

Type
Research Article
Copyright
Copyright © Materials Research Society 1991

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References

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Peculiarities of the Far-Infrared Reflection Spectra of the Doped Lead-Tin Tellurides Revealing the Persistent Photoconductivity Effect
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Peculiarities of the Far-Infrared Reflection Spectra of the Doped Lead-Tin Tellurides Revealing the Persistent Photoconductivity Effect
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Peculiarities of the Far-Infrared Reflection Spectra of the Doped Lead-Tin Tellurides Revealing the Persistent Photoconductivity Effect
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