3 years ago

Synthesis of sodium cobaltate $Na_{x}CoO_{2}$ single crystals with controlled Na ordering.

H. Alloul, I. R. Mukhamedshin, I. F. Gilmutdinov, F. Rullier-Albenque

We have synthesized single crystals of $Na_{x}CoO_{2}$ with x~0.8 by the optical floating zone technique. A thorough electrochemical treatment of the samples permitted us a controlled de-intercalation of Na which yields single crystal samples of stable Na ordered phases with x=0.5-0.8. The comparison of bulk magnetic properties with those observed in Na ordered powder samples confirms the high quality of these single crystal phases. On such Na ordered samples the ab plane resistivity could be measured and has been found quite reproducible for different sample batches. The data were analogous to those found in the initial experimental studies on single crystals. However, the lower residual resistivity and sharper anti-ferromagnetic transitions found on our samples confirm their high quality. Refined studies of transport parameters and quantum oscillations will hopefully allow us in the near future to correlate the Na atomic order, the Co charge order and the low T electronic structure for the various stable phases.

Publisher URL: http://arxiv.org/abs/1711.01611

DOI: arXiv:1711.01611v1

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