Magnetic-field-dependent second-harmonic generation study of Sr<sub>2</sub>IrO<sub>4</sub>

ORAL

Abstract

The quasi-two-dimensional layered oxide Sr2IrO4 has earned recognition for its novel spin-orbit Mott state and various analogies to cuprate physics. Neutron diffraction and x-ray scattering measurements show that it possesses a centrosymmetric magnetic ground state, consisting of a canted intralayer antiferromagnetic order with nonzero net magnetic moments in each layer stacked antiferromagnetically [1-4]. However, the onset of a second-harmonic generation (SHG) signal below the Néel temperature has suggested the presence of a distinct hidden magnetic order [5]. Using small in-plane magnetic fields, it is possible to manipulate the Néel order and help distinguish it from hidden order. In this talk, we will present magnetic-field-dependent SHG rotational anisotropy and microscopy studies that further elucidate the nature of this hidden state.

[1] Kim, B. J. et al. Science 323, 1329–1332 (2009).
[2] Ye, F. et al. Phys. Rev. B 87, 140406 (2013).
[3] Dhital, C. et al. Phys. Rev. B 87, 144405 (2013).
[4] Boseggia, S. et al. J. Phys. Condens. Matter 25, 422202 (2013).
[5] Zhao, L. et al. Nat. Phys. 12, 32–36 (2015).

–

Presenters

  • Kyle Seyler

    • Caltech

Authors

  • Kyle Seyler

    • Caltech

  • Alberto De la Torre

    • Caltech
    • Brown University

  • Zach Porter

    • University of California, Santa Barbara

  • Gang Cao

    • University of Colorado, Boulder
    • Department of Physics, University of Colorado at Boulder
    • Physics Department, University of Colorado Boulder
    • Physics, University of Colorado, Boulder
    • University of Colorado at Boulder
    • Physics, University of Colorado Boulder

  • Stephen Wilson

    • University of California, Santa Barbara
    • Materials Department, University of California, Santa Barbara
    • Materials Engineering, University of California, Santa Barbara
    • California NanoSystems Institute/Materials, University of California, Santa Barbara

  • David Hsieh

    • Institute for Quantum Information and Matter, California Institute of Technology
    • Caltech
    • Department of Physics, California Institute of Technology