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Superconducting phase diagram of Ni-doped magnetically ordered superconductor RbEu(Fe<sub>1-x</sub>Ni<sub>x</sub>)<sub>4</sub>As<sub>4</sub> for x ≤ 0.04 in pulsed fields up to 65 T

ORAL

Abstract

The superconducting phase diagram of single-crystal RbEu(Fe1-xNix)4As4 for x = 0.02, 0.03, 0.04 has been measured in pulsed magnetic fields up to 65 T using a proximity diode oscillator technique. Doping lowers Tc and slightly lowers the superconducting anisotropy, but does not affect the Eu magnetic order. Upon doping, the curvature of phase boundaries for both H || ab and H || c remains remarkably consistent, indicating that the suppression of Tc is doping driven, not disorder driven. As in the parent compound, Pauli limiting dominates Hc2ab, whereas orbital limiting dominates Hc2c. The resultant high Maki parameter α for H|| ab is consistent with a possible FFLO state at low temperatures, but none is seen in the accessible field range.

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Presenters

  • Matthew Smylie

    Hofstra University, Dept. of Physics and Astronomy, Hofstra University

Authors

  • Matthew Smylie

    Hofstra University, Dept. of Physics and Astronomy, Hofstra University

  • Kristin Willa

    Karlsruhe Institute of Technology

  • Yilmaz Simsek

    Sabanci University

  • Jinke Bao

    Argonne Natl Lab, Materials Science Division, Argonne Natl Lab, Argonne National Laboratory

  • Hendrik Hebbeker

    Hofstra University

  • Wai-Kwong Kwok

    Argonne National Laboratory, Material Sciences, Argonne National Laboratory, Argonne Natl Lab, Materials Science Division, Argonne National Laboratory, Materials Science Division, Argonne Natl Lab, Argonne National Lab

  • Duck Young Chung

    Argonne Natl Lab, Materials Science Division, Argonne National Laboratory, Materials Science Division, Argonne Natl Lab, Argonne National Laboratory, Material Science, Argonne National Laboratory

  • Mercouri Kanatzidis

    Northwestern University, Materials Science Division, Argonne National Laboratory, Department of Chemistry, Northwestern University, Chemistry, Northwestern Univ

  • John Singleton

    National High Magnetic Field Lab, Los Alamos, Los Alamos National Laboratory, NHMFL, Los Alamos National Laboratory, National High Magnetic Field Laboratory, Los Alamos National Laboratory, NHMFL, Los Alamos National Lab, Los Alamos National Lab.

  • Fedor Balakirev

    Los Alamos National Laboratory, Los Alamos Natl Lab, National High Magnetic Field Laboratory, Los Alamos National Laboratory

  • Ulrich Welp

    Argonne National Laboratory, Argonne Natl Lab, Materials Science Division, Argonne National Laboratory, Materials Science Division, Argonne Natl Lab, Argonne National Lab