Giant magnetic response of a two-dimensional antiferromagnetic iridate

ORAL

Abstract

Layered iridates are featured of preserving a hidden SU(2) symmetry such that anisotropic exchange interactions have no contribution to spin anisotropy. Achieving this symmetry, however, is highly challenging because it's necessary to incorporate strong spin-orbit coupling, control the 2D lattice structure, and minimize the interlayer coupling. We solved this issue through top-down design and bottom-up synthesis of SrIrO3 and SrTiO3 superlattices [1] to realize a pseudospin-half antiferromagnetic (AFM) square lattice. We observed giant AFM responses to sub-tesla external fields by exploiting the strong 2D critical fluctuations preserved under the symmetry-invariant exchange anisotropy. The observed field-induced logarithmic increase of the ordering demonstrates a new pathway for the highly efficient control of AFM order [2]. Further investigation on the transport properties suggests a novel coupling between AFM fluctuations and charge fluctuations, highlights the application potential in semiconductor devices.
[1] L. Hao, et.al. Phys. Rev. Lett. 119, 027204 (2017).
[2] L. Hao, et.al. Nat. Phys. 14, 806–810 (2018).

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Presenters

  • Lin Hao

    Physics, University of Tennessee, Department of Physics and Astronomy, University of Tennessee, Department of Physics and Astronomy, University of Tennesse

Authors

  • Lin Hao

    Physics, University of Tennessee, Department of Physics and Astronomy, University of Tennessee, Department of Physics and Astronomy, University of Tennesse

  • Derek Meyers

    Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Materials Science and Engineering, University of California, Berkeley, Brookhaven National Laboratory

  • Hidemaro Suwa

    Department of Physics and Astronomy, University of Tennessee

  • Junyi Yang

    Department of Physics and Astronomy, University of Tennessee

  • tamene R. Dasa

    Department of Materials Science and Engineering, University of Tennessee

  • Haixuan Xu

    University of Tennessee, Department of Materials Science and Engineering, University of Tennessee, Materials Science and Engineering, Univ of Tennessee, Knoxville

  • Cristian Batista

    Department of Physics & Astronomy, University of Tennessee, Knoxville, TN 37996, USA, Department of Physics and Astronomy, The University of Tennessee, University of Tennessee, Department of Physics and Astronomy, University of Tennessee, Department of Physics, University of Tennessee

  • Mark Dean

    Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Department of Condensed Matter Physics and Materials Science, Upton, New York 11973, USA, Brookhaven National Laboratory, BNL, Brookhaven National Laboratory, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory

  • Jian Liu

    University of Tennessee, Physics, University of Tennessee, Department of Physics and Astronomy, University of Tennessee, Physics and Astronomy, Univ of Tennessee, Knoxville, Department of Physics, University of Tennessee, Knoxville, University of Tennesse, Department of Physics and Astronomy, University of Tennesse