Tailoring the ferromagnetic easy axis of Ca<sub>2</sub>RuO<sub>4</sub> via epitaxial strain

ORAL

Abstract

Magnetism in strongly correlated ruthenates has been a central topic in condensed matter physics, where the spin degree of freedom is has a strong interplay with lattice, charge and orbital degrees of freedom. For instance, the Mott insulator Ca2RuO4 (CRO) can be turned into a ferromagnetic metal under epitaxial strain or hydrostatic pressure. Here, we have grown coherently strained CRO thin films on various substrates including SrLaAlO4 and YAlO3 via molecular beam epitaxy and investigated the strain effect on their magnetic properties. We have used angle-resolved magnetoresistance measurements to characterize the ferromagnetic easy axes of these films, and found that they are also drastically different from CRO bulk, and show how the magnetic easy axes can be tuned as a function of epitaxial strain. Our results manifest the complex interplay between the spin, lattice and orbital degree of freedom in CRO, as well as demonstrate a practical approach to tailor the magnetic properties in strongly correlated oxide materials via epitaxial strain, in general.

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Presenters

  • Ludi Miao

    • Cornell University

Authors

  • Ludi Miao

    • Cornell University

  • Hari Nair

    • Cornell University
    • Department of Materials Science and Engineering, Kavli Institute at Cornell for Nanoscale Science, Cornell University

  • Nathaniel Schreiber

    • Cornell University

  • Jacob Ruf

    • Cornell University
    • Laboratory of Atomic and Solid State Physics, Department of Physics, Kavli Institute at Cornell for Nanoscale Science, Cornell University

  • Matthew Fu

    • Cornell University

  • Yonghun Lee

    • Cornell University

  • Celesta Chang

    • Cornell University
    • Department of Physics, Cornell University

  • Jacob Ruff

    • Cornell High Energy Synchrotron Source, Cornell University
    • CHESS synchrotron, Cornell University
    • Cornell University

  • David Muller

    • Cornell University
    • School of Applied and Engineering Physics, Cornell University
    • Applied and Engineering Physics, Cornell University

  • Darrell Schlom

    • Cornell University
    • Department of Materials Science and Engineering, Cornell University
    • Department of Materials Science and Engineering, Kavli Institute at Cornell for Nanoscale Science, Cornell University
    • Materials Science and Engineering, Cornell University
    • Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853, USA
    • Platform for the Accelerated Realization, Analysis, & Discovery of Interface Materials (PARADIM), Cornell University

  • Kyle M Shen

    • Cornell University
    • Department of Physics, Cornell University, Cornell University
    • Department of Physics, Laboratory of Atomic and Solid State Physics, Cornell University
    • Laboratory of Atomic and Solid State Physics, Department of Physics, Kavli Institute at Cornell for Nanoscale Science, Cornell University