Article (Scientific journals)
Glass-Like Phonon Dynamics and Thermal Transport in a GeTe Nano-Composite at Low Temperature.
Cravero, R; Tlili, A; Paterson, J et al.
2024In Small, 20 (26), p. 2310209
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Keywords :
interface; nanocomposite; phonons; thermal conductivity; % reductions; Experimental evidence; Lower energies; Lows-temperatures; Nano composite; Phase-change memory; Phonon dynamics; Thermal transport; Total thermal conductivities; Vibrational density of state; Biotechnology; Chemistry (all); Biomaterials; Materials Science (all); Engineering (miscellaneous)
Abstract :
[en] In this work, the experimental evidence of glass-like phonon dynamics and thermal conductivity in a nanocomposite made of GeTe and amorphous carbon is reported, which is of interest for microelectronics, and specifically phase change memories. It is shown that, the total thermal conductivity is reduced by a factor of three at room temperature with respect to pure GeTe, due to the reduction of both electronic and phononic contributions. This latter, similarly to glasses, is small and weakly increasing with temperature between 100 and 300 K, indicating a mostly diffusive thermal transport and reaching a value of 0.86(7) Wm-1K-1 at room temperature. A thorough investigation of the nanocomposite's phonon dynamics reveals the appearance of an excess intensity in the low energy vibrational density of states, reminiscent of the Boson peak in glasses. These features can be understood in terms of an enhanced phonon scattering at the interfaces, due to the presence of elastic heterogeneities, at wavelengths in the 2-20 nm range. The findings confirm recent simulation results on crystalline/amorphous nanocomposites and open new perspectives in phonon and thermal engineering through the direct manipulation of elastic heterogeneities.
Disciplines :
Physics
Author, co-author :
Cravero, R;  Institute of Light and Matter, UMR5306 Université Lyon 1-CNRS, Université de Lyon, Villeurbanne cedex, F-69622, France ; Institut NEEL, CNRS, Université Grenoble Alpes, 25 avenue des Martyrs, Grenoble, F-38042, France
Tlili, A;  Institute of Light and Matter, UMR5306 Université Lyon 1-CNRS, Université de Lyon, Villeurbanne cedex, F-69622, France
Paterson, J;  CEA, LETI, Université Grenoble Alpes, Grenoble, 38000, France
Tomelleri, M;  CEA, LETI, Université Grenoble Alpes, Grenoble, 38000, France
Marcello, P;  Institute of Light and Matter, UMR5306 Université Lyon 1-CNRS, Université de Lyon, Villeurbanne cedex, F-69622, France
Debord, R;  Institute of Light and Matter, UMR5306 Université Lyon 1-CNRS, Université de Lyon, Villeurbanne cedex, F-69622, France
Pailhès, S;  Institute of Light and Matter, UMR5306 Université Lyon 1-CNRS, Université de Lyon, Villeurbanne cedex, F-69622, France
Bourgeois, O;  Institut NEEL, CNRS, Université Grenoble Alpes, 25 avenue des Martyrs, Grenoble, F-38042, France
Hippert, F;  CNRS, Grenoble INP, LMGP, Université Grenoble Alpes, Grenoble, F-38000, France
Le Qui, D;  FNRS and CESAM, Université de Liége, Sart-Tilman, 4000, Belgique
Raty, Jean-Yves  ;  Université de Liège - ULiège > Département de chimie (sciences)
Noe, P;  CEA, LETI, Université Grenoble Alpes, Grenoble, 38000, France
Giordano, V M ;  Institute of Light and Matter, UMR5306 Université Lyon 1-CNRS, Université de Lyon, Villeurbanne cedex, F-69622, France
More authors (3 more) Less
Language :
English
Title :
Glass-Like Phonon Dynamics and Thermal Transport in a GeTe Nano-Composite at Low Temperature.
Publication date :
June 2024
Journal title :
Small
ISSN :
1613-6810
eISSN :
1613-6829
Publisher :
John Wiley and Sons Inc, Germany
Volume :
20
Issue :
26
Pages :
e2310209
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique
Funding text :
The authors acknowledged fruitful discussion with A. Tanguy and K. Termentzidis, experimental help by A. Bosak, A. Chumakov and D. Bessas at ESRF. This work was financially supported by the ANR (project MAPS\u2010ANR\u201020\u2010CE05\u20100046 2019) and from the AURA region (Pack Ambition Recherche, project NanoCharme 2019). FNRS ABIGLO, CECI and Tier-1 Region wallonne?
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