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arXiv · 1803.07261

Frustration induced non-Curie-Weiss paramagnetism in La3Ir3O11: a fractional-valence-state iridate

J. Yang·J. R. Wang·W. L. Zhen·L. Ma·L. S. Ling·W. Tong·C. J. Zhang·L. Pi·W. K. Zhu
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Abstract

Experimental and theoretical studies are performed on La3Ir3O11, an iridate hosting a +4.33 fractional valence state for Ir ions and a three-dimensional frustrated structure composed of edge-shared Ir2O10 dimers. These features are expected to enhance inter-site hoppings and reduce magnetic moments of Ir ions. However, a spin-orbit driven Mott insulating transport is observed, which is supported by our first principles calculations. Most importantly, geometrical frustration and competing interactions result in a non-Curie-Weiss paramagnetic ground state, revealing no magnetic order down to 2 K. This unusual state is further demonstrated by a theoretical modeling process, suggesting a possible candidate for the spin liquid state.

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J. Yang, J. R. Wang, W. L. Zhen, L. Ma, L. S. Ling, W. Tong, C. J. Zhang, L. Pi, W. K. Zhu. 2018-03-20. Frustration induced non-Curie-Weiss paramagnetism in La3Ir3O11: a fractional-valence-state iridate. https://doi.org/10.1103/physrevb.100.205107

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