Doping induced magnetic clusters and Co spin state transition in Na_xCoO_2 with 0.78<x<.97

C. Bernhard, Ch. Niedermayer, A. Drew +7

By muon spin rotation we investigated the magnetic properties of a series of highly Na doped NaxCoO2 single crystals with 0.78(1)<x<0.97(1). Our data provide evidence for an intrin…