Faculté des sciences

Muon-spin rotation study of magnetism in NaxCoO₂ single crystals with 0.78 ≼ x ≼ 0.97

Bernhard, Christian ; Niedermayer, Ch. ; Drew, Alan J. ; Khaliullin, G. ; Bayrakci, S. ; Strempfer, J. ; Kremer, R. K. ; Chen, D. P. ; Lin, T. ; Keimer, B.

In: Europhysics Letters, 2007, vol. 80, no. 2, p. 27005

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 intrinsically inhomogeneous magnetic state which can be described in terms of hole-doping (Na vacancy)-induced magnetic clusters that percolate at 1−x≳0.04 until they yield a bulk... Plus

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    Summary
    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 intrinsically inhomogeneous magnetic state which can be described in terms of hole-doping (Na vacancy)-induced magnetic clusters that percolate at 1−x≳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.