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.

*This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. Part of this work is supported by the US DoE BES FWP Science in 100 T, and carried out at the National High Magnetic Field Laboratory, which is funded by NSF Cooperative Agreement DMR-1157490, the State of Florida and U.S. DoE.

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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