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

Masaaki Isobe, Hirotaka Okabe, Jun Akimitsu

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1 Citation (Scopus)


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 {pipe}J{pipe}. 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.

Original languageEnglish
Pages (from-to)394-397
Number of pages4
JournalJournal of the Korean Physical Society
Issue number3
Publication statusPublished - 2013 Aug


  • Iridates
  • M-I transition
  • Mott insulator
  • Non-Fermi liquid
  • Spin-orbit interaction


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