Influence of ferroelastic domain walls on thermal conductivity [* Cross-Reference *]

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Patrice Limelette; Mehdi El Kamily; Hugo Aramberri; Fabien Giovannelli; Miquel Royo; Riccardo Rurali; Isabelle Monot‐Laffez; Jorge Íñiguez; Guillaume F. Nataf, 2023, "Influence of ferroelastic domain walls on thermal conductivity [* Cross-Reference *]", https://lore.list.lu/citation?persistentId=perma:LIST.734D0P, LIST Open Repository, V1
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Description
Enabling on-demand control of heat flow is key for the development of next-generation electronic devices, solid-state heat pumps, and thermal logic. However, 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 ($\mathrm{LaAl}{\mathrm{O}}_{3}$) 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. (2023-10-13)
***This entry has been automatically imported via OpenAlex by LIST harvest scripts. Please refer to https://doi.org/10.1103/physrevb.108.144104 for the original and latest version of the publication*** (2026-07-01)
Subject Physics
Keyword Thermal conductivity, Materials science, Thermal, Condensed matter physics, Thermal conduction, Thermodynamics, Mechanics, Composite material, Physics
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