Investigation of band gap effect and dephasing on Raman line broadening for the highest-frequency Ag mode in comparison with SrWO4 and SrMoO4

被引：4

作者：

Suda, Jun ^{[1
]}

Zverev, Petr G. ^{[2
]}

机构：

[1] Chukyo Univ, Sch Engn, Dept Elect & Elect Engn, Tokyo, Japan

[2] Russian Acad Sci, AM Prokhorov Gen Phys Inst, Vavilov Str 38, Moscow 119991, Russia

来源：

VIBRATIONAL SPECTROSCOPY | 2016年 / 84卷

关键词：

Raman spectra; Linewidth; Phonon dispersion; Lattice dynamical perturbative approach; Dephasing effect; ACTIVE OPTICAL PHONONS; SPECTRA;

D O I：

10.1016/j.vibspec.2016.03.011

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The phonon dispersions of SrWO4 crystal were calculated using the lattice dynamical calculations approach. Spontaneous Raman spectra in SrWO4 were measured in the temperature range from 15 K to 295 K, and the temperature dependence of the linewidth of the A(g) (921-cm(-1)) Raman mode was analyzed using the lattice dynamical perturbative treatment. The experimental temperature dependence of the linewidth was well described by the calculated one which included both the cubic and the dephasing relaxation terms. The bands for internal modes in SrWO4 are broader than that in SrMoO4. The number of the up-conversion relaxation processes in SrWO4 is determined by the interaction between higher vibronic bands with lower bands. So the relative impact of the dephasing process in the linewidth broadening on SrWO4 crystal is smaller than that in SrMoO4. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：127 / 132

页数：6

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