The crystal growth and characterization of NaxCoO2 and NaxCoO2yH2O
D.P. Chen, H.C. Chen, A. Maljuk, A. Kulakov, H. Zhang, P. Lemmens and, C.T. Lin
TL;DR
This study systematically investigates the phase stability, structural, and superconducting properties of NaxCoO2 and its hydrated form, revealing that Na content has a weaker effect on superconductivity than previously thought.
Contribution
It provides new experimental insights into how hydration and Na content influence the structural and superconducting properties of NaxCoO2-based materials.
Findings
Na content dependence on Tc is weaker than previously reported
Controlled hydration affects structural and superconducting properties
Single crystals can be carefully deintercalated and hydrated
Abstract
A systematic study of NaxCoO2 (x=0.50 - 0.90) and NaxCoO2 yH(D)2O (x=0.26 - 0.42, y=1.3) has been performed to determine phase stability and the effect of hydration on the structural and superconducting properties of this system. We show that a careful control of the Na deintercalation process and hydration dynamics is possible in single crystals of this system. Furthermore, we give experimental evidence that the dependence of the superconducting transition temperature on Na content is much weaker than reported earlier. Implications of this effect for the understanding of the superconducting phase diagram are discussed.
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