Electrical tuning of Metamagnetic Transition of Quasi-2D J<sub>eff</sub>=1/2 Antiferromagnet by In Situ Anisotropic Strain

ORAL

Abstract

With the emergence of antiferromagnetic (AF) spintronics in recent years, Iridates have attracted great interests because of their exotic ground state with magneto transport properties, driven by the interaction between strong spin-orbit coupling (SOC) and electron correlations. As a prominent example, Sr2IrO4 is a quasi-two-dimensional Jeff =1/2 canted AF Mott insulator. Similar to S=1/2 moments, Jeff=1/2 moments have no single-ion anisotropy. They are however also very different in that the Jeff=1/2 moments can form significant inter-site quadrupoles that are highly sensitive to lattice distortion via the so-called ‘pseudo-JT’ effect. The strength and symmetry of the pseudospin-lattice coupling can be externally controlled by the application of in situ strain. In this work, we investigate the tuning of the metamagnetic transition of the AF structure in Sr2IrO4 by applying anisotropic strain of the B2g symmetry. By measuring the magnetoresistance (MR) and angular dependence of MR at different magnitude of in situ anisotropic strain, we observed clear shifts of the critical field of the metamagnetic transition. X-ray resonance magnetic scattering (XRMS) is performed to reveal the underlying modulation of the AF structure.

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Presenters

  • Shashi Pandey

    • University of Tennessee

Authors

  • Shashi Pandey

    • University of Tennessee

  • Han Zhang

    • University of Tennessee

  • Lin Hao

    • University of Tennessee

  • Junyi Yang

    • University of Tennessee

  • Joshua Sanchez

    • University of Washington

  • Qing Huang

    • Department of Physics and Astronomy, University of Tennessee, Knoxville
    • University of Tenessee
    • Department of Physics and Astronomy, University of Tennessee
    • National Institute of Standards and Technology
    • University of Tennessee

  • Kyle Noordhoek

    • University of Tennessee

  • Chengkun Xing

    • University of Tennessee

  • Dongliang Gong

    • University of Tennessee

  • Andrew May

    • Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA

  • Jiun-Haw Chu

    • University of Washington
    • Department of Physics, University of Washington, Seattle
    • Department of Physics, University of Washington
    • Physics, University of Washington

  • Jong-Woo Kim

    • Argonne National Laboratory
    • APS, Argonne National Laboratory

  • Philip Ryan

    • Argonne National Laboratory
    • APS, Argonne National Laboratory

  • Haidong Zhou

    • Dep. Physics and Astronomy, University of Tennessee, Knoxville TN
    • Department of Physics and Astronomy, University of Tennessee, Knoxville
    • University of Tenessee
    • University of Tennessee, Knoxville
    • Physics and Astronomy, University of Tennessee at Knoxville
    • University of Tennessee
    • Department of Physics and Astronomy, University of Tennessee

  • Jian Liu

    • University of Tennessee
    • University of Tennessee, Knoxville