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

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

2007-01-02

arxiv.org/abs/cond-mat/0701033v2

EPL 80, 27005 (2007)

Physics

Condensed Matter

Superconductivity

4 figures

Scientific paper

By muon spin rotation we investigated the magnetic properties of a series of highly Na doped NaxCoO2 single crystals with 0.78(1)0.04 until they yield a bulk magnetic state near x=0.78. Evidence for a strong (likely geometrical) frustration of the magnetic order is obtained from the anomalous doping dependence of the spin fluctuation rate (above the ordering temperature) which is strongly enhanced at x=0.78 as compared to x=0.97.

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