Effect of disorder on strange metal transport in a high-temperature superconductor

ORAL

Abstract

The "strange metal" parent phase of high-temperature superconductors displays a resistivity that scales linearly with temperature. Recent experiments reveal that the resistivity of these compounds also increases linearly with applied magnetic field, and is characterized by a striking scaling law between magnetic field and temperature. It has been suggested that this behavior is governed by physics beyond the standard quasiparticle picture of metals, but it is necessary to determine to what extent conventional transport theory is applicable; for example, elastic scattering from lattice imperfections typically has a well-defined effect on magnetotransport. In this study, we measure high-field transport of systematically disordered samples of a high-Tc iron-pnictide superconductor near an antiferromagnetic instability. Our data suggest that antiferromagnetic fluctuations dominate at low temperatures, producing robust transport scaling between temperature and magnetic field which is intimately tied to the onset of superconductivity.

*This work was Gordon and Betty Moore Foundation’s EPiQS Initiative through Grant GBMF4374, and by the NHMFL-PFF at Los Alamos National Laboratory through NSF Cooperative Agreement No. DMR 1157490 and the DoE.

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Presenters

  • Nikola Maksimovic

    • University of California, Berkeley

Authors

  • Nikola Maksimovic

    • University of California, Berkeley

  • Ian M Hayes

    • University of California, Berkeley

  • Vikram Nagarajan

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

  • John Singleton

    • National High Magnetic Field Laboratory, Los Alamos National Laboratory
    • MPA-MAG, Los Alamos National Laboratory
    • National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545
    • Los Alamos National Laboratory
    • NHMFL, Los Alamos National Labs
    • NHMFL, Los Alamos National Laboratory
    • Los Alamos, National High Magnetic Field Laboratory
    • NHMFL, Los Alamos Natl Lab
    • Los Alamos Natl Lab

  • Fedor Balakirev

    • Los Alamos National Laboratory
    • Los Alamos National Labs
    • Los Alamos, National High Magnetic Field Laboratory
    • National High Magnetic Field Lab, Los Alamos National Laboratory, Los Alamos, USA
    • National High Magnetic Field Laboratory

  • James G. Analytis

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