Electronic Structures of SrIrO<sub>3</sub>/SrTiO<sub>3</sub> Superlattices Revealed by Synchrotron X-Ray Diffraction and Spectroscopy

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  • WADATI Hiroki
    Institute for Solid State Physics, The University of Tokyo Quantum-Phase Electronics Center (QPEC), The University of Tokyo
  • YAMAMURA Shugen
    Institute for Solid State Physics, The University of Tokyo Quantum-Phase Electronics Center (QPEC), The University of Tokyo
  • ISHII Kenji
    Synchrotron Radiation Research Center, National Institutes for Quantum and Radiological Science and Technology
  • SUZUKI Motohiro
    Japan Synchrotron Radiation Research Institute
  • IKENAGA Eiji
    Japan Synchrotron Radiation Research Institute
  • MATSUNO Jobu
    RIKEN Center for Emergent Matter Science (CEMS)
  • TAKAGI Hidenori
    Department of Physics, The University of Tokyo Max Plank Institute for Solid State Research

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Other Title
  • 放射光X線の回折・分光で解明するSrIrO<sub>3</sub>/SrTiO<sub>3</sub>超格子の電子状態
  • 放射光X線の回折・分光で解明するSrIrO₃/SrTiO₃超格子の電子状態
  • ホウシャコウ Xセン ノ カイセツ ・ ブンコウ デ カイメイ スル SrIrO ₃/SrTiO ₃ チョウコウシ ノ デンシ ジョウタイ

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Abstract

<p>In the contemporary condensed-matter physics, Ir oxides have been attracting a lot of interest due to the novel interplay of spin-orbit coupling and electron correlations. Recently, there was a report about the fabrication of artificial superlattices [(SrIrO3)m, SrTiO3] (m=1, 2, 3, 4, and ∞) by pulsed laser deposition. There was a transition from the semimetal to the insulator by changing the number of SrIrO3 layers, m. We revealed the electronic structures of these superlattices by using resonant X-ray diffraction, hard X-ray photoemission spectroscopy, and X-ray magnetic circular dichroism. The magnetic structure of the m=1 superlattice was found to be canted in-plane antiferromagnetism, similar to that of Sr2IrO4. The electronic structure had a strong two-dimensional character, and was different from the other superlattices. The in-plane ferromagnetic component revealed by magnetization measurements was also observed by x-ray magnetic circular dichroism. The above results show that the m=1 superlattice has completely different electronic structures from those of bulk SrIrO3, clearly showing possibility of realizing novel electronic structures by using band engineering through dimensional control.</p>

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