Spin-orbit mott state in the novel quasi-2D antiferromagnet Ba 2IrO4

M. Isobe, H. Okabe, E. Takayama-Muromachi, A. Koda, S. Takeshita, M. Hiraishi, M. Miyazaki, R. Kadono, Y. Miyake, J. Akimitsu

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Abstract

The spin-orbit Mott state in the novel quasi-2D iridate Ba 2IrO4 was studied on crystal structure, electrical resistivity, magnetic susceptibility, and μSR experiments. Ba 2IrO4 crystallizes in a K2NiF4-type structure (I4/mmm, a = 4.030(1) Å and c = 13.333(4) Å) which includes IrO2 square planer lattices with straight Ir-O-Ir bonds. The minimal Mott-gap size is ∼70 meV The magnetic ground state is antiferromagnetic long-range order (TN ∼ 240 K) without spin canting. The magnetic moment (|μ| ∼ 0.34 μB/Ir) is much reduced by a low-dimensional quantum spin fluctuation with a large intra-plane correlation |J|. The critical exponent (β ∼ 0.18) suggests that the magnetic state is classified into 2-D X-Y or (anisotropic) Heisenberg spin systems with weak 3-D interlayer coupling |J'|.

Original languageEnglish
Article number032028
JournalJournal of Physics: Conference Series
Volume400
Issue numberPART 3
DOIs
Publication statusPublished - Jan 1 2012
Externally publishedYes
Event26th International Conference on Low Temperature Physics, LT 2011 - Beijing, China
Duration: Aug 10 2011Aug 17 2011

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Isobe, M., Okabe, H., Takayama-Muromachi, E., Koda, A., Takeshita, S., Hiraishi, M., Miyazaki, M., Kadono, R., Miyake, Y., & Akimitsu, J. (2012). Spin-orbit mott state in the novel quasi-2D antiferromagnet Ba 2IrO4. Journal of Physics: Conference Series, 400(PART 3), [032028]. https://doi.org/10.1088/1742-6596/400/3/032028