Superconducting phase diagram of magnetically ordered superconductor RbEuFe<sub>4</sub>As<sub>4</sub> in pulsed fields up to 65 T

ORAL

Abstract

The superconducting phase diagram of single-crystal RbEuFe4As4 (Tc ~ 36.5 K), which has long-range Eu magnetic order at Tm ~ 15 K, has been measured in pulsed magnetic fields up to 65 T using a proximity diode oscillator technique. Upon decreasing temperature, the anisotropy Hc2ab/Hc2c decreases from 1.8 near Tc towards unity indicating significant Pauli paramagnetic limiting effects for both H // (110) and H // (001). This is born out in theoretical fits for a Fermi surface in the form of warped cylinders, yielding a high in-plane Maki parameter of ~2.4, suggesting that a low temperature FFLO state may exist above 65 T. Irradiation with 5 MeV protons to a dose of 5x1016 p/cm2 suppresses Tc by ~ 3K, a substantial increase in vortex pinning and a reversal in anisotropy at temperatures below 15K.

*This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. K. W. acknowledges support from the Swiss National Science Foundation through an Early Postdoc Mobility fellowship. 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

    • Materials Science Division, Argonne National Laboratory
    • Physics and Astronomy, Hofstra University

Authors

  • Matthew Smylie

    • Materials Science Division, Argonne National Laboratory
    • Physics and Astronomy, Hofstra University

  • Kristin Willa

    • Materials Science Division, Argonne National Laboratory
    • Argonne National Laboratory

  • Jinke Bao

    • Materials Science Division, Argonne National Laboratory
    • Argonne National Laboratory

  • Roland Willa

    • Materials Science Division, Argonne National Laboratory
    • Argonne National Laboratory

  • Alexei E Koshelev

    • Materials Science Division, Argonne National Laboratory
    • Argonne National Laboratory

  • Wai-Kwong Kwok

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

  • Duck Young Chung

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

  • Mercouri Kanatzidis

    • Department of Chemistry, Northwestern University
    • Chemistry, Northwestern University
    • Chemistry, Northwestern University, Evanston, IL 60208
    • Northwestern University
    • Materials Science Division, Argonne National Laboratory
    • Argonne National Laboratory

  • John Singleton

    • National High Magnetic Field Laboratory, Los Alamos National Laboratory
    • MPA-MAG, Los Alamos National Laboratory
    • National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545
    • Los Alamos National Laboratory
    • NHMFL, Los Alamos National Labs
    • NHMFL, Los Alamos National Laboratory
    • Los Alamos, National High Magnetic Field Laboratory
    • NHMFL, Los Alamos Natl Lab
    • Los Alamos Natl Lab

  • Fedor Balakirev

    • Los Alamos National Laboratory
    • Los Alamos National Labs
    • Los Alamos, National High Magnetic Field Laboratory
    • National High Magnetic Field Lab, Los Alamos National Laboratory, Los Alamos, USA
    • National High Magnetic Field Laboratory

  • Prashanta Niraula

    • Western Michigan University

  • EIMAN Bokari

    • Western Michigan University

  • Asghar Kayani

    • Western Michigan University

  • Ulrich Welp

    • Materials Science Division, Argonne National Laboratory
    • Argonne National Laboratory