Complex orbital state stabilized by strong spin-orbit coupling in a metallic iridium oxide IrO2

Yasuyuki Hirata, Kenya Ohgushi, Jun Ichi Yamaura, Hiroyuki Ohsumi, Soshi Takeshita, Masaki Takata, Taka Hisa Arima

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15 Citations (Scopus)

Abstract

Resonant x-ray diffraction experiments were performed for the metallic iridium oxide IrO2. We observed anisotropic tensor of susceptibility (ATS) scattering, the spectrum of which shows a sharp contrast between the L3 and L2 edges. At the L3 edge, resonance excitations were clearly observed from the core 2p orbitals to both the 5d t2g and eg orbitals. In contrast, the resonance mode associated with 5d t2g orbitals was indiscernible at the L 2 edge. This contrasting behavior indicates that Ir 5d t2g orbitals are fairly close to the Jeff=1/2 state due to the strong spin-orbit coupling in 5d transition-metal ions, as in the Mott insulator Sr2IrO4. Our results clearly demonstrate that ATS scattering is a useful probe for investigating complex orbital states in a metallic material, where novel phenomena such as the spin Hall effect are expected.

Original languageEnglish
Article number161111
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number16
DOIs
Publication statusPublished - 2013 Apr 15
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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