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

Antonio Caretta*, Michiel C. Donker, Diederik W. Perdok, Davood Abbaszadeh, Alexey O. Polyakov, Remco W. A. Havenith, Thomas T. M. Palstra, Paul H. M. van Loosdrecht

*Corresponding author for this work

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7 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number054111
Number of pages6
JournalPhysical Review. B: Condensed Matter and Materials Physics
Volume91
Issue number5
DOIs
Publication statusPublished - 25-Feb-2015

Keywords

  • RELAXATION
  • TRANSPORT
  • ELECTRON
  • GRAPHENE
  • COPPER
  • DECAY

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