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Journal Article

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

MPS-Authors
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Bernhard,  C.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Khaliullin,  G.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Bayrakci,  S.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Strempfer,  J.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Kremer,  R. K.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Chen,  D. P.
Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society;

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Lin,  C. T.
Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society;

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Keimer,  B.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Bernhard, C., Niedermayer, C., Drew, A., Khaliullin, G., Bayrakci, S., Strempfer, J., et al. (2007). Muon-spin rotation study of magnetism in NaxCoO2 single crystals with 0.78 ≤ x ≤ 0.97. EPL, 80(2): 27005.


Cite as: https://hdl.handle.net/21.11116/0000-000E-B701-2
Abstract
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 greater than or similar to 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. Copyright (C) EPLA, 2007.