Effects of strain and disorder nematicity of Ba<sub>1-x</sub>K<sub>x</sub>Fe<sub>2</sub>As<sub>2</sub> superconductor

ORAL

Abstract

Hole doping by substituting Ba for K in BaFe2As2 parent compound results in a very complex phase diagram that includes nematic, stripe, orthorhombic (C2) and tetragonal (C4) antiferromagnetic phases with substantial doping intervals where these phases coexist with superconductivity. We use controlled uniaxial strain (mechanical) and artificial disorder (induced by electron irradiation) to study the interplay of these phases in the under-doped compositions. Experimentally, anisotropic in-plane resistivity was measured in high quality single crystals of (Ba1-xKx)Fe2As2 in pristine state and after low-temperature electron irradiation. Polarized optical microscopy was used to visualize the evolution of structural domains and correlate it with transport studies.

*This work was supported by the US DOE, Office of Science, BES Materials Science and Engineering Division under contract # DE-AC02-07CH11358.

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Presenters

  • Erik Timmons

    • Iowa State University and Ames Laboratory
    • Ames Laboratory and Department of Physics & Astronomy, Iowa State University
    • Ames Laboratory
    • Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University

Authors

  • Erik Timmons

    • Iowa State University and Ames Laboratory
    • Ames Laboratory and Department of Physics & Astronomy, Iowa State University
    • Ames Laboratory
    • Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University

  • Makariy Tanatar

    • Iowa State University and Ames Laboratory
    • Ames Laboratory and Department of Physics & Astronomy, Iowa State University
    • Ames Laboratory
    • Ames Laboratory and Iowa state University
    • Iowa State University

  • Kyuil Cho

    • Ames Laboratory and Department of Physics & Astronomy, Iowa State University
    • Ames Laboratory
    • Ames Laboratory and Iowa state University

  • Yong Liu

    • Ames Laboratory and Department of Physics & Astronomy, Iowa State University
    • Ames Laboratory

  • T. A. Lograsso

    • Ames Laboratory and Department of Physics & Astronomy, Iowa State University
    • Ames Laboratory
    • Ames Laboratory, Iowa State University

  • Ruslan Prozorov

    • Ames Lab
    • Iowa State University and Ames Laboratory
    • Ames Laboratory and Department of Physics & Astronomy, Iowa State University
    • Ames Laboratory
    • Ames Laboratory and Iowa state University
    • Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University

  • Marcin Konczykowski

    • Ecole Polytechnique