Elastoresistivity measurements in a 65 T pulsed magnet on Fe-based superconductors

ORAL

Abstract

One of the most striking signatures of the nematic transition in the underdoped iron-based superconductors is a diverging elastoresistivity, which is the linear response of the resistivity anisotropy to the corresponding symmetry-breaking strain. Elastoresistivity, however, cannot be measured in the superconducting state; tracking the nematic fluctuations down to the putative quantum critical point near optimal doping necessitates the use of extreme magnetic fields to suppress superconductivity. We report the first elastoresistivity experiments in pulsed magnetic fields up to 65 T on near-optimally-doped Ba(Fe1-xCox)2As2 at temperatures down to 1.3 K, and discuss the technical advances required to make such a measurement possible within the few millisecond window when the field is above Hc2. These new techniques expand the applicability of elastoresistivity measurement for disentangling the role of nematic fluctuations in strongly correlated systems.

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Presenters

  • Joshua Straquadine

    Physics, Stanford University, Stanford University

Authors

  • Joshua Straquadine

    Physics, Stanford University, Stanford University

  • Johanna Palmstrom

    Stanford University

  • Philip Walmsley

    Physics, Stanford University, Stanford University

  • Alexander T Hristov

    Stanford University

  • Franziska Weickert

    Florida State University, National High Magnetic Field Laboratory, Los Alamos, NHMFL, FSU, NHMFL, Los Alamos National Labs, Pulsed Field Faclity, National High Magnetic Field Laboratory

  • Fedor F. Balakirev

    Pulsed Field Faclity, National High Magnetic Field Laboratory

  • Marcelo Jaime

    National High Magnetic Field Laboratory, Los Alamos, Los Alamos National Laboratory, National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545, NHMFL, Los Alamos National Labs, NHMFL-LANL, Pulsed Field Faclity, National High Magnetic Field Laboratory

  • Ross McDonald

    Los Alamos National Laboratory, Los Alamos National Labs, National High Magnetic Field Laboratory, LANL, Pulsed Field Faclity, National High Magnetic Field Laboratory, National High Magnetic Field Laboratory

  • Ian R Fisher

    Physics, Stanford University, Applied Physics, Stanford University, Stanford University, Pulsed Field Faclity, National High Magnetic Field Laboratory