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Magnetic states in quasi-2-D iridium oxides with large spin-orbit coupling

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Abstract

The magnetic states in the novel K2NiF4-type quasi-2-D spin-orbit-induced Mott insulator Ba2IrO4 was studied using magnetic susceptibility, muon spin rotation (µSR), and high-pressure resistivity measurements. In Ba2IrO4, a Néel ordered state was found to be stabilized at temperatures below T N (Néel temperature) ∼ 240 K. The critical exponent β ∼ 0.18 suggests a quasi-2-D Heisenberg antiferromagnetic state on the IrO2 planar square lattice. The magnetic moment is significantly reduced to ∼0.34 µB/Ir-atom, probably due to a low-dimensional quantum spin fluctuation with a large magnetic intra-plane correlation |J|. A non-Fermi liquid-like behavior with carrier scattering due to the spin fluctuation was observed in the metallic state under high pressures of more than 13.8 GPa.

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Authors and Affiliations

  1. Strongly Correlated Materials Group, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan

    Masaaki Isobe & Hirotaka Okabe

  2. Department of Physics and Mathematics, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5258, Japan

    Jun Akimitsu

Authors
  1. Masaaki Isobe
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  2. Hirotaka Okabe
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  3. Jun Akimitsu
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Correspondence to Masaaki Isobe.

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Isobe, M., Okabe, H. & Akimitsu, J. Magnetic states in quasi-2-D iridium oxides with large spin-orbit coupling. Journal of the Korean Physical Society 63, 394–397 (2013). https://doi.org/10.3938/jkps.63.394

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  • DOI: https://doi.org/10.3938/jkps.63.394

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