Weak antiferromagnetism of J eff=12 band in bilayer iridate Sr 3Ir 2O 7

S. Fujiyama, K. Ohashi, H. Ohsumi, K. Sugimoto, T. Takayama, T. Komesu, M. Takata, T. Arima, H. Takagi

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46 Citations (Scopus)

Abstract

The antiferromagnetic structure of Sr 3Ir 2O 7, the bilayer analog of a spin-orbital Mott insulator Sr 2IrO 4, was revealed by resonant magnetic x-ray diffraction. Contrasting intensities of the magnetic diffraction at the Ir L III and L II edges show a J eff=1/2 character of the magnetic moment as is argued in Sr 2IrO 4. The magnitude of moment, however, was found to be smaller than that of Sr 2IrO 4 by a factor of 5 to 6, implying that Sr 3Ir 2O 7 is no longer a Mott insulator but a weak antiferromagnet. An evident change of the temperature dependence of the resistivity at T N, from almost temperature-independent resistivity to insulating, strongly suggests that the emergent weak magnetism controls the charge gap. The magnetic structure was found to be an out-of-plane collinear antiferromagnetic ordering in contrast to the in-plane canted antiferromagnetism in Sr 2IrO 4, originating from the strong bilayer antiferromagnetic coupling.

Original languageEnglish
Article number174414
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number17
DOIs
Publication statusPublished - 2012 Nov 16
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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