Volume 80, Number 2, October 2007
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||20 September 2007|
Muon-spin rotation study of magnetism in NaxCoO2 single crystals with 0.78 x 0.97
University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials (FriMat) Chemin du Musee 3, CH-1700 Fribourg, Switzerland
2 Max-Planck-Institute for Solid State Research - Heisenbergstrasse 1, D-70569 Stuttgart, Germany
3 Paul-Scherrer-Institut - CH-5232 Villigen PSI, Switzerland
Accepted: 1 September 2007
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 ≳ 0.04 until they yield a bulk magnetic state near . 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 as compared to .
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 75.25.+z – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.) / 76.75.+i – Muon spin rotation and relaxation
© Europhysics Letters Association, 2007
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