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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