Spin-Orbit Mott State in the Novel Quasi-2D Antiferromagnet Ba2IrO4

The spin-orbit Mott state in the novel quasi-2D iridate Ba2IrO4 was studied on crystal structure, electrical resistivity, magnetic susceptibility, and μSR experiments. Ba2IrO4 crystallizes in a K2NiF4-type structure (I4/mmm, a = 4.030(1) Å and c = 13.333(4) Å) which includes IrO2 square planer latti...

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Bibliographic Details
Published in:Journal of physics. Conference series 2012-12, Vol.400 (3)
Main Authors: Isobe, M, Okabe, H, Takayama-Muromachi, E, Koda, A, Takeshita, S, Hiraishi, M, Miyazaki, M, Kadono, R, Miyake, Y, Akimitsu, J
Format: Article
Language:English
Subjects:
Antiferromagnetism
Crystal structure
Interlayers
Lattices
Long range order
Magnetic moments
Magnetic permeability
Physics
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Summary:The spin-orbit Mott state in the novel quasi-2D iridate Ba2IrO4 was studied on crystal structure, electrical resistivity, magnetic susceptibility, and μSR experiments. Ba2IrO4 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′|.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/400/3/032028