Influence of isomorphous substitution and external hydrostatic pressure on the fundamental light-absorption edge in Sn(Pb)2P2S(Se)6 crystals |
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| Authors: | A G Slivka E I Gerzanich V S Shusta P P Guranich |
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| Institution: | (1) Technical Physics, Saarland University, Saarbruecken, 66123, Germany |
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| Abstract: | The influence of isomorphous substitution and high hydrostatic pressure on the behavior of the fundamental absorption edge
(AE) inSn(Pb)
2
P
2
S(Se)
6 ferroelectric crystals is studied. It is shown that the AE in these crystals is caused by an electron-phonon interaction,
and oscillation frequencies of interacting phonons correspond to oscillations of theP
2
S(Se)
6]4− anion sublattice. Baric and concentration changes of the Uhrbach rule parameters are analyzed.
Uzhgorod State University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 23–28, September, 1999. |
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