PHONONS IN POLYMORPHOUS PBTE FILMS .1. INFRARED REFLECTIVITY OF PBTE FILMS ON KCL SUBSTRATES

被引：13

作者：

BALEVA, M

BOZUKOV, L

MOMTCHILOVA, M

机构：

[1] Fac. of Phys., Sofia Univ.

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1992年 / 4卷 / 19期

关键词：

D O I：

10.1088/0953-8984/4/19/006

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

PbTe films with various thicknesses, grown by laser-assisted deposition of KCl substrates, have been investigated. X-ray diffractograms have been taken in the angular range from 10-degrees to 70-degrees. FIR reflection spectra have been studied in the range from 20 to 5000 cm-1. X-ray diffractograms indicated strained layers with HP PbTe phases: GeS and CsCl type. The frequencies of the infrared modes in these HP phases were determined by fitting the experimental spectra with the reflectance calculated for four media: air and two absorbing layers on absorbing substrate. It was found that the lineshape of the reflectance spectra was governed by a resonant-like frequency dependence of the electron damping parameter. The resonant-like shape of the damping parameter spectrum was attributed to electron scattering off potential wells, formed by dislocations.

引用

页码：4633 / 4644

页数：12

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