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).]

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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