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

Authors

C Bernhard, Max-Planck-Institute For Solid State Research
Ch Neidermayer, Max-Planck-Institute For Solid State Research
A Drew, University of Friboury, Switzerland
G Khaliullin, Max-Planck-Institute For Solid State Research
S P. Bayrakci, Max-Planck-Institute For Solid State Research
J Strempfer, Max-Planck-Institute For Solid State Research
R K. Kremer, Max-Planck-Institute For Solid State Research
Dapeng Chen, University of WollongongFollow
C T Lin, Max-Planck-Institute For Solid State ResearchFollow
B Keimer, Max-Planck-Institute For Solid State Research

RIS ID

41358

Publication Details

Bernhard, C., Neidermayer, C., Drew, A., Khaliullin, G., Bayrakci, S. P., Strempfer, J., Kremer, R. K., Chen, D. P., Lin, C. & Keimer, B. (2007). Muon-spin rotation study of magnetism in NaxCoO2 single crystals with 0.78 ≤ x ≤ 0.97. Europhysics Letters: a letters journal exploring the frontiers of physics, 80 (2), 27005-p1-27005-p6.

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−x0.04 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.