Non-local microwave electrodynamics in PdCoO<sub>2</sub>

ORAL

Abstract

The delafossite metal PdCoO2 has been shown to exhibit an array of exotic DC transport phenomena due to its exceptionally long mean free path and nearly hexagonal Fermi surface [1]. Here we present AC microwave spectroscopy measurements in two geometries for which, from the symmetry of the crystallographic lattice, one would conventionally expect the same result. Instead, the two measurements differ strongly in magnitude and frequency dependence. This is evidence for non-local electrodynamics, in which the mean free path is longer than the electromagnetic penetration depth and the conductivity is wavevector-dependent. While the theoretical description of non-local electrodynamics has historically been rooted in ellipsoidal Fermi surfaces [2], here we discuss how the strongly-faceted Fermi surface of PdCoO2 results in novel phenomenology.

[1] A.P. Mackenzie, Rep. Prog. Phys. 80 032501 (2017)
[2] G.E.H. Reuter and E.H. Sondheimer, Proc. R. Soc. Lond. 195, 336 (1948)

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Presenters

  • Graham Baker

    • University of British Columbia

Authors

  • Graham Baker

    • University of British Columbia

  • James Day

    • University of British Columbia

  • Seunghyun Khim

    • Max Planck Institute for Chemical Physics of Solids

  • Mohamed Oudah

    • University of British Columbia
    • Max Planck Institute for Solid State Research, Stuttgart, Germany

  • Roderich Moessner

    • Max Planck Institute Dresden
    • Max Planck Institute for the Physics of Complex Systems
    • Max-Planck-Institut für Physik komplexer Systeme

  • Joerg Schmalian

    • Karlsruhe Institute of Technology
    • Institute for Theory of Condensed Matter, Karlsruhe Institute of Technology
    • Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, Germany

  • Andrew Mackenzie

    • Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
    • Max Planck Institute for Chemical Physics of Solids
    • Max Planck Institute for the Chemical Physics of Solids

  • Douglas A. Bonn

    • Quantum Matter Institute, University of British Columbia
    • University of British Columbia
    • Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, Canada