Quasielastic Light Scattering and Second Sound in SrTiO3

被引：3

作者：

Koreeda, Akitoshi ^{[1
]}

Takano, Ryuta ^{[1
]}

Saikan, Seishiro ^{[1
]}

机构：

[1] Tohoku Univ, Grad Sch Sci, Dept Phys, Sendai, Miyagi 9808578, Japan

来源：

FERROELECTRICS | 2009年 / 378卷

关键词：

BROAD DOUBLET SPECTRA; BRILLOUIN-SCATTERING; CENTRAL PEAK;

D O I：

10.1080/00150190902848131

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the light-scattering spectrum in SrTiO3 in the low frequency range ( 1000 GHz). Two components of quasielastic peaks were observed at relatively high temperatures. We found that the collective phonon-excitation in a crystal accounts for both quasielastic components. The anomalous broad Brillouin component in SrTiO3, which was reported previously, can also be accounted for by our model, and it has been strongly indicated that the origin of the broad doublet is second sound. The broader quasielastic component arises from the interactions between two second sounds, and it can be understood as the Mountain mode in crystals.

引用

页码：129 / 134

页数：6

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