Abstract
Magnetic properties in the novel spin-orbit Mott insulator Ba2IrO4 were studied using muon spin rotation (μSR) technique. Zero-field μSR experiments revealed that Ba2IrO4 shows an antiferromagnetic transition at TN ∼ 240 K without any spontaneous magnetization. The most stable μ+ site was determined by the electrostatic (Madelung) potential calculation. The effective magnetic moment of the iridium ions (|μ|) in the antiferromagnetic ordered state was calculated using a dipolar-field model, with an internal field obtained by μSR experiments. The magnetic moment is significantly reduced (|μ| ∼ 0.34 μB) due to a low-dimensional quantum spin fluctuation with a large intra-plane correlation. The magnetic ground state of the spin-orbit Mott insulator Ba2IrO4 is quite similar to those in parent materials of high-TC cuprate superconductors such as La2CuO4.
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