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

  • Bernhard, Christian University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials (FriMat), Switzerland - Max-Planck-Institute for Solid State Research, Stuttgart, Germany
  • Niedermayer, Ch. Paul-Scherrer-Institut, Villigen, Switzerland
  • Drew, Alan J. University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials (FriMat), Switzerland
  • Khaliullin, G. Max-Planck-Institute for Solid State Research, Stuttgart, Germany
  • Bayrakci, S. Max-Planck-Institute for Solid State Research, Stuttgart, Germany
  • Strempfer, J. Max-Planck-Institute for Solid State Research, Stuttgart, Germany
  • Kremer, R. K. Max-Planck-Institute for Solid State Research, Stuttgart, Germany
  • Chen, D. P. Max-Planck-Institute for Solid State Research, Stuttgart, Germany
  • Lin, T. Max-Planck-Institute for Solid State Research, Stuttgart, Germany
  • Keimer, B. Max-Planck-Institute for Solid State Research, Stuttgart, Germany
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    20.09.2007
Published in:
  • Europhysics Letters. - 2007, vol. 80, no. 2, p. 27005
English 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.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
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Persistent URL
https://folia.unifr.ch/unifr/documents/300466
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