Regensburg 2025 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 9: Poster
MM 9.42: Poster
Monday, March 17, 2025, 18:30–20:30, P1
Low-temperature thermal conductivity of YAlO3 and YbAlO3 — Parisa Mokhtari1,2,3, •Ulrike Stockert3, Stanislav Nikitin4, Leonid Vasylechko5, Manuel Brando2, and Elena Hassinger3,2 — 1Department of Physics, Technical University of Munich, 85748 Garching, Germany — 2Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany — 3Faculty of Physics, Technische Universität Dresden, 01062 Dresden, Germany — 4PSI Center for Neutron and Muon Sciences, 5232 Villigen PSI, Switzerland — 5Lviv Polytechnic National University, Lviv 79013, Ukraine
YAlO3 is a popular substrate, laser, and scintillator material used at temperatures down to those of liquid helium. A good thermal conductivity is required for many applications for instance to facilitate energy release in lasers or thermal coupling via substrates.
We present for the first time thermal conductivity data on YAlO3 below 80 K, covering the T range from 2 K to 300 K. In addition, we have studied the thermal conductivity of YbAlO3 in the temperature window from 50 K to 300 K. Both materials are very good thermal conductors. The thermal transport in these electrical insulators is phononic and can be fitted by the Callaway model. We discuss our results with respect to the relevance of different scattering processes, the origin of the thermal conductivity anisotropy, and the influence of Y-Yb exchange on the thermal transport. Our results on YAlO3 confirm the suitability of the material for applications requiring a low thermal resistance at temperatures down to liquid He.
Keywords: thermal conductivity; YAP; Callaway model