Influence of ferroelastic domain walls on thermal conductivity - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B Année : 2023

Influence of ferroelastic domain walls on thermal conductivity

Résumé

Enabling on-demand control of heat flow is key for the development of next generation of electronic devices, solid-state heat pumps and thermal logic. However, a precise and agile tuning of the relevant microscopic material parameters for adjusting thermal conductivities remains elusive. Here, we study several single crystals of lanthanum aluminate (LaAlO3) with different domain structures and show that ferroelastic domain walls behave as boundaries that act like efficient controllers to govern thermal conductivity. At low temperature (3 K), we demonstrate a fivefold reduction in thermal conductivity induced by domain walls orthogonal to the heat flow and a twofold reduction when they are parallel to the heat flow. Atomistic calculations fully support this experimental observation. By breaking down phonon scattering mechanisms, we also analyze the temperature dependence of the thermal conductivity to derive a quantitative relation between thermal conductivity variations and domain wall organization and density.
Fichier principal
Vignette du fichier
LaAlO3_thermalconductivity_final.pdf (1.01 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Licence : CC BY - Paternité

Dates et versions

hal-04244990 , version 1 (16-10-2023)

Licence

Paternité

Identifiants

Citer

P. Limelette, M. El Kamily, H. Aramberri, Fabien Giovannelli, M. Royo, et al.. Influence of ferroelastic domain walls on thermal conductivity. Physical Review B, 2023, 108 (14), pp.144104. ⟨10.1103/PhysRevB.108.144104⟩. ⟨hal-04244990⟩
20 Consultations
27 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More