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

doi:10.1103/PhysRevB.91.054111

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 language	English
Article number	054111
Journal	Physical Review B (Condensed Matter and Materials Physics)
Volume	91
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevB.91.054111
Publication status	Published - 25 Feb 2015

Keywords

RELAXATION
TRANSPORT
ELECTRON
GRAPHENE
COPPER
DECAY

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10.1103/PhysRevB.91.054111

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Cite this

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title = "Measurement of the acoustic-to-optical phonon coupling in multicomponent systems",

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.",

keywords = "RELAXATION, TRANSPORT, ELECTRON, GRAPHENE, COPPER, DECAY",

author = "Antonio Caretta and Donker, {Michiel C.} and Perdok, {Diederik W.} and Davood Abbaszadeh and Polyakov, {Alexey O.} and Havenith, {Remco W. A.} and Palstra, {Thomas T. M.} and {van Loosdrecht}, {Paul H. M.}",

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doi = "10.1103/PhysRevB.91.054111",

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AU - Caretta, Antonio

AU - Donker, Michiel C.

AU - Perdok, Diederik W.

AU - Abbaszadeh, Davood

AU - Polyakov, Alexey O.

AU - Havenith, Remco W. A.

AU - Palstra, Thomas T. M.

AU - van Loosdrecht, Paul H. M.

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PY - 2015/2/25

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N2 - 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.

AB - 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.

KW - RELAXATION

KW - TRANSPORT

KW - ELECTRON

KW - GRAPHENE

KW - COPPER

KW - DECAY

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