Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 27: Correlated Electrons: Other Materials
TT 27.3: Talk
Tuesday, March 19, 2024, 10:00–10:15, H 3010
The Lorenz ratio as a guide to scattering contributions to Planckian transport — •Fei Sun1, Simli Mishra1, Ulrike Stockert1, Ramzy Daou2, Naoki Kikugawa3, Robin S. Perry4,5, Elena Hassinger1, Sean A. Hartnoll6, Andrew P. Mackenzie1,7, and Veronika Sunko1,8 — 1MPI, CPfS, Dresden, Germany — 2CRISMAT, Caen, France — 3National Institute for Materials Science, Ibaraki, Japan — 4University College London, London, UK — 5ISIS Neutron and Muon Source, UK — 6University of Cambridge, Cambridge, UK — 7University of St. Andrews, St. Andrews, UK — 8University of California Berkeley, USA
A characteristic quantum-mechanical time scale of approximately ℏ/kBT has been identified recently in both theory and experiment, leading to speculation that it may be the shortest meaningful time in many-body physics. It can be probed in depth by studying the scattering of electrons in solids, however, in metallic oxides, which are among the most studied materials, analysis of electrical transport does not satisfactorily identify the relevant scattering mechanism at high T near room temperature. We employ a contactless optical method to measure thermal diffusivity in two Ru-based layered perovskites, Sr3Ru2O7 and Sr2RuO4, and use the measurements to extract the dimensionless Lorenz ratio. We show how the analysis of high-T thermal transport can both give important insight into dominant scattering mechanisms, and be offered as a stringent test of theories attempting to explain anomalous scattering.
Keywords: Planckian transport; Lorenz ratio; thermal transport; electron-electron scattering