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American Physical Society, Physical review B, 22(88), 2013

DOI: 10.1103/physrevb.88.220414

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Evolution of magnetism in the single-crystal honeycomb iridates(Na1−xLix)2IrO3

Journal article published in 2013 by G. Cao, T. F. Qi, L. Li ORCID, J. Terzic, V. S. Cao, S. J. Yuan, M. Tovar, G. Murthy, R. K. Kaul
This paper is available in a repository.
This paper is available in a repository.

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Abstract

We report the successful synthesis of single-crystals of the layered iridate, (Na$_{1-x}$Li$_{x}$)$_2$IrO$_3$, $0≤ x ≤ 0.9$, and a thorough study of its structural, magnetic, thermal and transport properties. The new compound allows a controlled interpolation between Na$_2$IrO$_3$ and Li$_2$IrO$_3$, while maintaing the novel quantum magnetism of the honeycomb Ir$^{4+}$ planes. The measured phase diagram demonstrates a dramatic suppression of the Néel temperature, $T_N$, at intermediate $x$ suggesting that the magnetic order in Na$_2$IrO$_3$ and Li$_2$IrO$_3$ are distinct, and that at $x≈ 0.7$, the compound is close to a magnetically disordered phase that has been sought after in Na$_2$IrO$_3$ and Li$_2$IrO$_3$. By analyzing our magnetic data with a simple theoretical model we also show that the trigonal splitting, on the Ir$^{4+}$ ions changes sign from Na$_2$IrO$_3$ and Li$_2$IrO$_3$, and the honeycomb iridates are in the strong spin-orbit coupling regime, controlled by $\jeff=1/2$ moments. ; Comment: updated version with more data