Effects of strain and disorder nematicity of Ba1-xKxFe2As2 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.

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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