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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).

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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