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

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    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
    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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