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  • 1.
    Smylie, M. P.
    et al.
    Materials Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, United States.
    Willa, K.
    Materials Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, United States.
    Bao, J. -K
    Materials Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, United States.
    Ryan, K.
    Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States.
    Islam, Z.
    Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, IL 60439, United States.
    Claus, H.
    Materials Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, United States.
    Simsek, Y.
    Materials Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, United States.
    Diao, Zhu
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), MPE-lab.
    Rydh, A.
    Department of Physics, Stockholm University, Stockholm, SE-106 91, Sweden.
    Koshelev, A. E.
    Materials Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, United States.
    Kwok, W. -K
    Materials Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, United States.
    Chung, D. Y.
    Materials Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, United States.
    Kanatzidis, M. G.
    Materials Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, United States.
    Welp, U.
    Materials Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, United States.
    Anisotropic superconductivity and magnetism in single-crystal RbEuFe4As42018In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 98, no 10, article id 104503Article in journal (Refereed)
    Abstract [en]

    We investigate the anisotropic superconducting and magnetic properties of single-crystal RbEuFe4As4 using magnetotransport and magnetization measurements. We determine a magnetic ordering temperature of the Eu moments of Tm=15K and a superconducting transition temperature of Tc=36.8K. The superconducting phase diagram is characterized by high upper critical field slopes of -70 and -42 kG/K for in-plane and out-of-plane fields, respectively, and a surprisingly low superconducting anisotropy of Γ=1.7. Ginzburg-Landau parameters of κc∌67 and κab∌108 indicate extreme type-II behavior. These superconducting properties are in line with those commonly seen in optimally doped Fe-based superconductors. In contrast, Eu magnetism is quasi-two dimensional (2D), as evidenced by highly anisotropic in-plane and out-of-plane exchange constants of 0.6 K and <0.04 K. A consequence of the quasi-2D nature of the Eu magnetism are strong magnetic fluctuation effects, a large suppression of the magnetic ordering temperature as compared to the Curie-Weiss temperature, and a kinklike anomaly in the specific heat devoid of any singularity. Magnetization curves reveal a clear magnetic easy-plane anisotropy with in-plane and out-of-plane saturation fields of 2 and 4 kG. © 2018 American Physical Society.

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