Superconducting phase diagram of magnetically ordered superconductor RbEuFe4As4 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.

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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