Response of CaK(Fe<sub>1-<i>x</i></sub>Ni<i><sub>x</sub></i>)<sub>4</sub>As<sub>4</sub> (<i>x</i> = 0 and 0.05) superconductor to non-magnetic disorder induced by 2.5 MeV electron irradiation

ORAL

Abstract

Temperature dependent electrical resistivity and London penetration depth were measured in single crystals of CaK(Fe1-xNix)4As4 (x = 0 and 0.05, as determined by wavelength dispersive spectroscopy) before and after 2.5 MeV electron irradiation of different doses. We observed increase of residual resistivity and suppression of the superconducting transition Tc, while the low temperature behavior of the penetration depth remained exponential, consistent with a robust s± pairing. Overall, the x=0 compound is quite similar to a slightly overdoped BaK1-yKyFe2As2 with y ≈ 0.5. The Ni-doped composition, x=0.05, can be mapped onto the underdoped BaK1-yKyFe2As2 with y ≈ 0.2 by using its Tc value and shows similar increase of the superconducting gap anisotropy, confirming that Ni doping moves the composition toward the electron doped side.

*This work was supported by the US DOE, Office of Science, BES Materials Science and Engineering Division under contract # DE-AC02-07CH11358. WRM was supported by the Gordon and Betty Moore Foundation's EPiQS Initiative through Grant GBMF4411.

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Presenters

  • Serafim Teknowijoyo

    • Iowa State University and Ames Laboratory
    • Ames Laboratory and Iowa state University

Authors

  • Serafim Teknowijoyo

    • Iowa State University and Ames Laboratory
    • Ames Laboratory and Iowa state University

  • Kyuil Cho

    • Iowa State University and Ames Laboratory

  • 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

  • William Meier

    • Iowa state university/Ames Laboratory
    • Iowa State University and Ames Laboratory
    • Iowa State University/Ames Laboratory
    • Ames Laboratory and Iowa State University, Dept. of Physics and Astronomy
    • Dept. of Physics, Iowa State Univ
    • Ames Laboratory

  • Sergey Bud'ko

    • The Ames Laboratory
    • Iowa state university/Ames Laboratory
    • Iowa State University and Ames Laboratory
    • Iowa State University/Ames Laboratory
    • Iowa State University / Ames Laboratory
    • Ames Laboratory and Iowa State University, Dept. of Physics and Astronomy
    • Dept. of Physics, Iowa State Univ
    • Ames Lab
    • Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University
    • Ames Laboratory
    • Department of Physics and Astronomy, Ames Laboratory and Iowa State University

  • Paul Canfield

    • Ames Laboratory and Iowa State University
    • Ames Laboratory, Iowa State University
    • Department of Physics and Astronomy, Iowa State University
    • Dept. of Physics and Astronomy, Ames Laboratory/Iowa State University
    • Iowa state university/Ames Laboratory
    • Ames Laboratory and Iowa State Univ
    • Iowa State University and Ames Laboratory
    • Iowa State University/Ames Laboratory
    • Iowa State University
    • Iowa State University / Ames Laboratory
    • Dept. of Physics, Iowa State Univ
    • Ames Lab
    • Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University
    • Iowa State Univ
    • Ames Laboratory
    • Department of Physics and Astronomy, Ames Laboratory and 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
    • Laboratoire des Solides Irradiés, École Polytechnique, CNRS, CEA, Université Paris-Saclay