Regensburg 2022 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 21: Transport in Materials: Thermal transport

MM 21.4: Talk

Wednesday, September 7, 2022, 11:00–11:15, H45

Investigation of temperature dependent thermal transport in Sr₂RuO₄ and Sr₃Ru₂O₇ over a wide temperature range — Fei Sun¹, •Simli Mishra¹, Ulrike Stockert¹, Ramzy Daou², Naoki Kikugawa³, Robin S Perry⁴, Sean A Hartnoll⁵, Andrew P Mackenzie^1,6, and Veronika Sunko^1,7 — ¹Max Planck Institute - CPfS, Dresden, Germany — ²CRISMAT,ENSICAEN, UNICAEN, Normandie Université, Caen, France — ³NIMS, Ibaraki , Japan — ⁴LCN, University College London, London, UK — ⁵DAMTP, University of Cambridge, Cambridge, UK — ⁶School of Physics and Astronomy, University of St. Andrews, UK — ⁷Department of Physics, University of California, Berkely, USA

We use optics to study thermal transport by modifying a typical laser pump-probe technique. A direct measurement of thermal conductivity is very challenging at high temperatures. In contrast, our method measures temperature dependent diffusivity over a wide range of temperature (10K up to 330K). As thermal diffusivity is the ratio of the thermal conductivity to the heat capacity, we can access the higher temperature thermal conductivity by an optical measurement of diffusivity and standard heat capacity measurement. We have used this technique to measure thermal diffusivity of two strongly correlated metals, Sr₂RuO₄ and Sr₃Ru₂O₇. This temperature dependent thermal transport combined with the resistivity measurements offers an insight into the electronic and phononic contributions to the quasiparticle scattering.