SKM 2023 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 6: Transport in Materials: Ion, Charge and Heat Transport
MM 6.7: Vortrag
Montag, 27. März 2023, 12:00–12:15, SCH A 118
Non-local microwave electrodynamics in ultra-pure PdCoO2 — •Graham Baker1, Timothy W Branch1, Jake Bobowski1, James Day1, Davide Valentinis2, Mohamed Oudah1, Philippa McGuinness3, Seunghyun Khim3, Piotr Surówka4, Yoshiteru Maeno5, Roderich Moessner6, Jörg Schmalian2, Andrew Mackenzie3, and Doug Bonn1 — 1University of British Columbia — 2Karlsruhe Institute of Technology — 3Max Planck Institute for Chemical Physics of Solids — 4Wrocław University of Science and Technology — 5Kyoto University — 6Max Planck Institute for the Physics of Complex Systems
There has been significant recent interest in unconventional electronic transport regimes in which a local, Ohmic relationship between electric current and field breaks down. To date, the vast majority of experimental work has been done in the DC limit. Here we introduce a novel approach via AC measurements with a bespoke microwave spectrometer, using the skin effect rather than sample dimensions to induce non-local transport. Through measurements on Sr2RuO4 and Sn, we verify the predictions for the magnitude and frequency dependence of the surface resistance for the classical and anomalous skin effects. Data from PdCoO2, in contrast, deviate from any previous prediction of frequency-dependent surface resistance. Analysis of such data required the construction of a more complete electrodynamic theory of metals than previously existed, and allows us to conclude that the PdCoO2 data are due to the combination of a highly anisotropic Fermi surface and a contribution from momentum-conserving scattering.