Enhanced low energy fluctuations and increasing out-of-plane coherence in vacancy ordered NaxCoO2

P. Lemmens, V. Gnezdilov, G. J. Shu +4

We report Raman scattering experiments on the strongly correlated electron system NaxCoO2 with x= 0.71 and ordered Na vacancies. In this doping regime, NaxCoO2 exhibits a large and…