Influence of ferroelastic domain walls on thermal conductivity
Reference:
Limelette, P., El Kamily, M., Aramberri, H., Giovannelli, F., Royo, M., Rurali, R., Monot-Laffez, I., Íñiguez, J. and Nataf, G.F., 2023. Influence of ferroelastic domain walls on thermal conductivity. Physical Review B, 108(14), p.144104.
PI-KEM Product referenced:
Lanthanum Single Crystals
Abstract:
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 (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.
Authors:
P. Limelette, M. El Kamily, H. Aramberri, F. Giovannelli, M. Royo, R. Rurali, I. Monot-Laffez, J. Íñiguez, and G. F. Nataf
Organisation / Department Address:
- 1Research Group for Materials, Microelectronics, Acoutics and Nanotechnologies (GREMAN) UMR7347, Centre national de la recherche scientifique (CNRS), University of Tours, Institut National des Sciences Appliquées (INSA) Centre Val de Loire, 37000 Tours, France
- Materials Research and Technology Department, Luxembourg Institute of Science and Technology (LIST), L-4362 Esch-sur-Alzette, Luxembourg
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Spain
- Department of Physics and Materials Science, University of Luxembourg, L-4422 Belvaux, Luxembourg
