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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 rangeFei Sun1, •Simli Mishra1, Ulrike Stockert1, Ramzy Daou2, Naoki Kikugawa3, Robin S Perry4, Sean A Hartnoll5, Andrew P Mackenzie1,6, and Veronika Sunko1,71Max 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.

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