Measurement of the acoustic-to-optical phonon coupling in multicomponent systems

被引：7

作者：

Caretta, Antonio ^{[1
]}

Donker, Michiel C. ^{[1
]}

Perdok, Diederik W. ^{[1
]}

Abbaszadeh, Davood ^{[1
]}

Polyakov, Alexey O. ^{[1
]}

Havenith, Remco W. A. ^{[1
,2
]}

Palstra, Thomas T. M. ^{[1
]}

van Loosdrecht, Paul H. M. ^{[1
]}

机构：

[1] Univ Groningen, Zernike Inst Adv Mat, NL-9747 AG Groningen, Netherlands

[2] Univ Ghent, Dept Inorgan & Phys Chem, Ghent Quantum Chem Grp, B-9000 Ghent, Belgium

来源：

PHYSICAL REVIEW B | 2015年 / 91卷 / 05期

关键词：

RELAXATION; TRANSPORT; ELECTRON; GRAPHENE; COPPER; DECAY;

D O I：

10.1103/PhysRevB.91.054111

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper we investigate the acoustic-to-optical up-conversion phonon processes in a multicomponent system. These processes take place during heat transport and limit the efficiency of heat flow. By combining time-resolved optical and heat capacity experiments we quantify the thermal coupling constant to be g similar to 0.4 10(17) W/Km(3). The method is based on selective excitation of a part of a multicomponent system, and the measurement of the thermalization dynamics by probing the linear birefringence of the sample with femtosecond resolution. In particular, we study a layered multiferroic organic-inorganic hybrid, in the vicinity of the ferroelectric phase transition. A diverging term of the heat capacity is associated to soft-mode dynamics, in agreement with previous spectroscopy measurements.

引用

页数：6

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