Suppression of Eu magnetic order in single crystals of the magnetically ordered superconductor RbEu<sub>1-x</sub>Ca<sub>x</sub>Fe<sub>4</sub>As<sub>4</sub>

ORAL

Abstract

The magnetically ordered, relatively low anisotropy superconductor RbEuFe4As4, with a high superconducting transition temperature Tc (~37 K) and a high magnetic ordering temperature Tm (~15 K), may host topological states and is an excellent platform for investigating interactions between magnetism and superconductivity. We show that light doping of Ca-for-Eu in single crystal material lowers Tm by ~1.5 K but does not affect Tc or the superconducting anisotropy, indicating limited coupling between magnetic order and superconductivity. However, there is a clear effect on the superconducting critical current measured via magnetic hysteresis loops in both pristine and doped material, suggesting novel pinning effects. Metamagnetic transitions are also observed in-field in the doped material.

*This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.

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Presenters

  • Matt P Smylie

    • Hofstra University

Authors

  • Matt P Smylie

    • Hofstra University

  • Ramakanta Chapai

    • Argonne National Laboratory

  • Ulrich Welp

    • Argonne National Laboratory

  • Angelo J Patrizi

    • Hofstra University

  • Nia Holloman

    • Hofstra University

  • Duck Young Chung

    • Argonne National Laboratory

  • Mercouri G Kanatzidis

    • Northwestern University
    • Department of Chemistry, Northwestern University

  • Wai-Kwong Kwok

    • Argonne National Laboratory