Evolution of Magnetism in Single-Crystal Honeycomb Iridates
| Autor: | Cao, G., Qi, T. F., Li, L., Terzic, J., Cao, V. S., Yuan, S. J., Tovar, M., Murthy, G., Kaul, R. K. |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 88, 220414(R) (2013) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.88.220414 |
| Popis: | We report the successful synthesis of single-crystals of the layered iridate, (Na$_{1-x}$Li$_{x}$)$_2$IrO$_3$, $0\leq x \leq 0.9$, 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 N\'eel 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 $x\approx 0.7$, 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 |
| Databáze: | arXiv |
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