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, and Paul H. M. van Loosdrecht
Phys. Rev. B 91, 054111 – Published 25 February 2015

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 g0.41017 W/Km3. 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.

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  • Received 17 April 2014
  • Revised 22 December 2014

DOI:https://doi.org/10.1103/PhysRevB.91.054111

©2015 American Physical Society

Authors & Affiliations

Antonio Caretta1,*, Michiel C. Donker1, Diederik W. Perdok1, Davood Abbaszadeh1, Alexey O. Polyakov1, Remco W. A. Havenith1,2, Thomas T. M. Palstra1, and Paul H. M. van Loosdrecht1

  • 1Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
  • 2Ghent Quantum Chemistry Group, Department of Inorganic and Physical Chemistry, Ghent University, Krijgslaan 281 (S3), B-9000 Gent, Belgium

  • *a.caretta@rug.nl

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Issue

Vol. 91, Iss. 5 — 1 February 2015

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