Tuning electronic and magnetic states of pseudospin-½ square lattice in artificial iridate superlattice

ORAL

Abstract

The discovery of Jeff=1/2 Mott insulating state in the Sr2IrO4 has drawn a lot of attention since this 2D pseudospin-1/2 square lattice is analogous to high-Tc cuprates. On the other hand, the emergent phenomena exhibited by the pseudospin-1/2 electrons could be highly susceptible to small changes in the structural degrees of freedom due to the cooperation between electronic correlation and spin-orbit coupling (SOC). Engineering a layered structure of pseudospin-1/2 square lattice in artificial superlattices can afford extra tunability of the electronic and magnetic interactions for stabilizing novel collective quantum states. Through controlling dimensionality, spacing layer and epitaxial strain in perovskite iridate-based superlattices, we have investigated the evolution of the spin-orbit-entangled electronic and magnetic ground state under different control parameters. The results from a suite of characterizations, including transport measurements, magnetometry, and synchrotron-based x-ray spectroscopy and scattering, reveal new routes to drive the collective behavior of the interacting pseudospin-1/2 electrons, which is not achievable in the bulk.

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Presenters

  • Junyi Yang

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

Authors

  • Junyi Yang

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

  • Lin Hao

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

  • Derek Meyers

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

  • Han Zhang

    • Physics and Astronomy, Univ of Tennessee, Knoxville

  • Haixuan Xu

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

  • 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