Resonant X-ray Scattering Study of Epitaxial Ca<sub>2</sub>RuO<sub>4</sub> Thin Films

ORAL

Abstract

We report a comprehensive study of epitaxial Ca2RuO4 thin films using resonant X-ray scattering at the Ru-L2 and L3 absorption edges, which directly probe the Ru 4d valence states. The strong modification of the electronic properties by biaxial strain is readily seen in transport measurements, which reveal a tuning from an insulator (on NdCaAlO4(110) substrates) to a metal (on LaSrAlO4(001)). Using magnetometry and resonant X-ray scattering, we can identify ferromagnetic phases in films on LaSrAlO4(001), LaSrAlO4(110) and LaAlO3(100) substrates and antiferromagnetic phases in films on NdCaAlO4(110), LaSrAlO4(110) and LaAlO3(100). The antiferromagnetic phases are most compatible with the B-Type magnetic structure found in the pressurized bulk system exhibiting a TN≈150 K. While the magnetic moment direction is typically along (010) in bulk Ca2RuO4, a polarization analysis of magnetic reflections of the film on NCAO(110) shows an unusual magnetic moment direction towards (-102).

*We acknowledge financial support by the European Research Council under Advanced Grant No. 669550 (Com4Com).

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Presenters

  • Christopher Dietl

    • Institute for Basic Science

Authors

  • Christopher Dietl

    • Institute for Basic Science

  • Joel Bertinshaw

    • Max Planck Institute for Solid State Research

  • Shyam Kanta Sinha

    • Max Planck Institute for Solid State Research

  • Georg Cristiani

    • Max Planck Institute for Solid State Research

  • Gennady Logvenov

    • Max Planck Institute for Solid State Research

  • Yury Khaydukov

    • Max Planck Institute for Solid State Research

  • Thomas Keller

    • Max Planck Institute for Solid State Research

  • Katrin Fürsich

    • Max Planck Institute for Solid State Research

  • Gideok Kim

    • Max Planck Institute for Solid State Research

  • Daniel Putzky

    • Max Planck Institute for Solid State Research

  • Laurence Bouchenoire

    • XMas, European Synchrotron Radiation Facility

  • Joerg Strempfer

    • Deutsches Elektronen-Synchrotron DESY
    • Advanced Photon Source, Argonne National Laboratory

  • Sonia Francoual

    • Deutsches Elektronen-Synchrotron
    • Deutsches Elektronen-Synchrotron DESY

  • Yongseong Choi

    • Argonne National Laboratory
    • Advanced Photon Source, Argonne National Laboratory
    • Advanced Photon Source
    • Argonne National Lab

  • Peter Wochner

    • Max Planck Institute for Solid State Research

  • Shyjumon Ibrahimkutty

    • Max Planck Institute for Solid State Research

  • Peter van Aken

    • Max Planck Institute for Solid State Research

  • Bumjoon Kim

    • Pohang University
    • Pohang University of Science and Technology
    • Physics, Pohang University of Science and Technology
    • Department of Physics, POSTECH
    • Institute for Basic Science
    • Department of Physics, Pohang University of Science and Technology

  • Bernhard Keimer

    • max planck inst.
    • Max Planck Institute for Solid State Research
    • max planck institut
    • Max-Planck-Institut
    • Max Planck Institute for Solid State Research, Stuttgart, Germany
    • Max Planck Institute Stuttgart