Coexistence of weak ferromagnetism and superconductivity in rutheno-cuprate RuSr$_2$Eu$_{1.5}$Ce$_{0.5}$Cu$_2$O$_{10}$

ORAL

Abstract

We address the question of possible coexistence between weak ferromagnetism (W-FM) and superconductivity (SC) in the Ru-1222 rutheno-cuprate layered structure using element-specific x-ray magnetic circular dichroism (XMCD) and x-ray absorption fine structure (XAFS) measurements. XMCD probes Ru magnetization independently from the paramagnetic contributions of rare-earth ions and XAFS is ideally suited for detection of nano-sized impurities that may go undetected in diffraction measurements. We report the presence of a significant zero-field FM component (0.21 $\mu\rm{_B}$/Ru) associated with Ru ions in the Ru-1222 lattice. The results, together with bulk susceptibility and resistivity measurements, imply by necessity coexistence of W-FM and SC at the atomic level in this rutheno-cuprate structure [see N. M. Souza-Neto {\it et al.}, Phys. Rev. B {\bf 80}, R140414 (2009).]

*Work at Argonne supported by the U.S. DOE, Office of Science, under Contract No. DE-AC-02-06CH11357.

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Authors

  • Daniel Haskel

    • Advanced Photon Source, Argonne National Laboratory, Argonne IL 60439, USA
    • Advanced Photon Source, Argonne National Laboratory, Argonne IL 60439

  • Narcizo M. Souza-Neto

    • Advanced Photon Source, Argonne National Laboratory, Argonne IL 60439, USA

  • J. C. Lang

    • Advanced Photon Source, Argonne National Laboratory, Argonne IL 60439, USA
    • Argonne National Laboratory

  • O. Chmaissem

    • MSD, Argonne National Laboratory, and Physics, Northern Illinois University, De Kalb IL, USA
    • Physics Department, Northern Illinois University, DeKalb, IL 60115
    • Physics Department, Northern Illinois University, DeKalb, IL 60115 and Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
    • Department of Physics, Northern Illinois University, DeKalb, IL and Materials Science Division, Argonne National Laboratory, Argonne, IL
    • Department of Physics, Northern Illinois University, DeKalb, IL 60115

  • B. Dabrowski

    • MSD, Argonne National Laboratory, and Physics, Northern Illinois University, De Kalb IL, USA
    • Physics Department, Northern Illinois University, DeKalb, IL 60115
    • Physics Department, Northern Illinois University, DeKalb, IL 60115 and Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
    • Department of Physics, Northern Illinois University, DeKalb, IL and Materials Science Division, Argonne National Laboratory, Argonne, IL
    • Northern Illinois University
    • Physics Department, Northern Illinois University, DeKalb IL 60115
    • Department of Physics, Northern Illinois University, DeKalb, IL 60115

  • Israel Felner

    • Racah Institute of Physics, The Hebrew University, Jerusalem, Israel