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We report Raman scattering experiments on the strongly correlated electronsystem NaxCoO2 with x= 0.71 and ordered Na vacancies. In this doping regime,NaxCoO2 exhibits a large and unusual thermopower and becomes superconductingupon hydration. Our Raman scattering data reveal pronounced low energyfluctuations that diverge in intensity at low temperatures. Related to thesefluctuations is a drastic decrease of an electronic scattering rate from 50 to3 cm-1. This observation is quite different from the behavior of Na disorderedsamples that have a larger and temperature independent scattering rate.Simultaneously with the evolution of the scattering rate, phonon anomaliespoint to an increasing out-of-plane coherence of the lattice with decreasingtemperature. These observations may indicate the condensation of spin polaronsinto an unusual, highly dynamic ground state.

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