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Time-reversal symmetry breaking hidden order in Sr2(Ir,Rh)O4

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  • Jaehong Jeong

    (Laboratoire Léon Brillouin, CEA-CNRS, Université Paris-Saclay)

  • Yvan Sidis

    (Laboratoire Léon Brillouin, CEA-CNRS, Université Paris-Saclay)

  • Alex Louat

    (Laboratoire de Physique des Solides, Université Paris-Sud, Université Paris-Saclay)

  • Véronique Brouet

    (Laboratoire de Physique des Solides, Université Paris-Sud, Université Paris-Saclay)

  • Philippe Bourges

    (Laboratoire Léon Brillouin, CEA-CNRS, Université Paris-Saclay)

Abstract

Layered 5d transition iridium oxides, Sr2(Ir,Rh)O4, are described as unconventional Mott insulators with strong spin-orbit coupling. The undoped compound, Sr2IrO4, is a nearly ideal two-dimensional pseudospin-1/2 Heisenberg antiferromagnet, similarly to the insulating parent compound of high-temperature superconducting copper oxides. Using polarized neutron diffraction, we here report a hidden magnetic order in pure and doped Sr2(Ir,Rh)O4, distinct from the usual antiferromagnetic pseudospin ordering. We find that time-reversal symmetry is broken while the lattice translation invariance is preserved in the hidden order phase. The onset temperature matches that of the odd-parity hidden order recently highlighted using optical second-harmonic generation experiments. The novel magnetic order and broken symmetries can be explained by the loop-current model, previously predicted for the copper oxide superconductors.

Suggested Citation

  • Jaehong Jeong & Yvan Sidis & Alex Louat & Véronique Brouet & Philippe Bourges, 2017. "Time-reversal symmetry breaking hidden order in Sr2(Ir,Rh)O4," Nature Communications, Nature, vol. 8(1), pages 1-6, April.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms15119
    DOI: 10.1038/ncomms15119
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