Size restricted magnetotransport in the non-magnetic delafossite metals PdCoO<sub>2 </sub>and PtCoO<sub>2</sub>

ORAL

Abstract

Ultra-pure delafossite metals can present bulk mean free paths as long as tens of microns, long enough such that the momentum conservation of the electron fluid might play a role in electrical transport [1]. As the signatures of this are most prominent in the mesoscopic limit, we use focussed ion beam (FIB) techniques to thin bulk samples down to widths as small as submicron, much smaller than the bulk mean free path. In this talk I will present magnetotransport measurements in these highly-conducting delafossites, specifically PdCoO2 and PdCoO2, at the mesoscopic limit. Magnetic field introduces a variable length-scale, the cyclotron radius, to the system which can be used to tune through different transport regimes. I will discuss the ballistic and hydrodynamic signatures in the transport that in principle become accessible through magnetic field tuning in such mesoscopic samples.

[1] Moll, P. J. W., Kushwaha, P., Nandi, N., Schmidt, B. & Mackenzie, A. P. Evidence for hydrodynamic electron flow in PdCoO2. Science. 351, 1061–1064 (2016).

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Presenters

  • Nabhanila Nandi

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

Authors

  • Nabhanila Nandi

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

  • Thomas Scaffidi

    • University of California, Berkeley
    • Department of Physics, University of California, Berkeley, California 94720, USA

  • Seunghyun Khim

    • Max Planck Institute for Chemical Physics of Solids
    • Max-Planck-Institute for Chemical Physics of Solids
    • Chemical Physics of Solids, Max Planck Institute, Dresden, Germany
    • Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
    • Physics of Quantum Materials, Max Planck Institute of Chemical Physics of Solids
    • MPI for Chemical Physics of Solids, Dresden, Germany

  • Pallavi Kushwaha

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

  • Joel Moore

    • University of California, Berkeley
    • Department of Physics, University of California, Berkeley, California 94720, USA
    • University of California, Berkeley and Lawrence Berkeley National Laboratory
    • Physics, University of California, Berkeley
    • University of California, Berkeley, and Lawrence Berkeley National Laboratory

  • Andrew Mackenzie

    • Max-Planck-Institute for Chemical Physics of Solids
    • Max Planck Institute for Chemical Physics of Solids
    • Max Planck Institute for Chemical Physics of Solids, Dresden,Germany
    • Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
    • Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
    • Max-Planck-Institut for Chemical Physics of Solids
    • Physics of Quantum Materials, Max Planck Institute of Chemical Physics of Solids