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Updated: Sep 6, 2026

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
Spin-orbit-enhanced correlation sensitivity and anomalous magnetic response in non-dimerized 4d4ilmenite CdRuO3
Yuya Haraguchi1, Hayato Yatsuzuka2, Hiroko Aruga Katori3
1Department of Applied Physics and Chemical Engineering, Tokyo University of Agriculture and Technology, the 4th Building of Faculty of Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo, Tokyo, Tokyo, 184-8588, Japan.
Abstract:
We report the synthesis and physical properties of CdRuO3, a nominal Ru4+4d4ilmenite with edge-sharing RuO6honeycomb layers. Powder x-ray diffraction establishes a crystallographically non-dimerizedR-3 structure with equivalent Ru-Ru bonds and a strongly distorted RuO6environment. The compacted-pellet resistivity is nonmetallic but non-Arrhenius, while the heat capacity contains a finite residual linear term. Matched nonmagnetic calculations show that PBE+Uwithout spin-orbit coupling remains metallic or semimetallic up toUeff= 3 eV, whereas PBE+SOC+Uexhibits a strongUeffdependence and opens a direct gap of approximately 55 meV at Γ for Ueff= 2.5 eV. Spin-orbit coupling therefore markedly enhances the correlation sensitivity of the non-cubic Ru t2gmanifold. After subtraction of a dilute Curie-Weiss defect contribution, the susceptibility remains weakly nonmonotonic and is inconsistent with both an ordinary Pauli response and independent spin-only S = 1 moments. CdRuO3thus realizes the non-dimerized structural branch predicted for ruthenium ilmenites, but not a simple robust multiorbital metal.
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