Series of Bulk Magnetic Phase Transitions in NaxCoO2: a muSR study

P. Mendels; D. Bono; J. Bobroff; G. Collin; D. Colson; N. Blanchard; H. Alloul; I. Mukhamedshin; F. Bert; A. Amato; A. D. Hillier

doi:10.1103/PhysRevLett.94.136403

Series of Bulk Magnetic Phase Transitions in NaxCoO2: a muSR study

Strongly Correlated Electrons 2009-11-11 v1

Authors: P. Mendels , D. Bono , J. Bobroff , G. Collin , D. Colson , N. Blanchard , H. Alloul , I. Mukhamedshin , F. Bert , A. Amato , A. D. Hillier

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Abstract

Using muon spin rotation, well-defined bulk ~ 100% magnetic phases in NaxCoO2 are revealed. A novel magnetic phase is detected for x = 0.85 with the highest transition temperature ever observed for x >= 0.75. This stresses the diversity of x >=0.75 magnetic phases and the link between magnetic and structural degrees of freedom. For the charge-ordered x = 0.50 compound, a cascade of transitions is observed below 85 K. From a detailed analysis of our data, we conclude that the ordered moment varies continuously with temperature and suggest that the two secondary transitions at 48 K and 29 K correspond to a moderate reorientation of antiferromagnetically coupled moments.

Keywords

magnetic phase transitions NaxCoO2 muSR charge ordering antiferromagnetic coupling

Cite

@article{arxiv.cond-mat/0501203,
  title  = {Series of Bulk Magnetic Phase Transitions in NaxCoO2: a muSR study},
  author = {P. Mendels and D. Bono and J. Bobroff and G. Collin and D. Colson and N. Blanchard and H. Alloul and I. Mukhamedshin and F. Bert and A. Amato and A. D. Hillier},
  journal= {arXiv preprint arXiv:cond-mat/0501203},
  year   = {2009}
}

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Sumitted to Phys. Rev. Lett., 1 Oct 2004, revised version

Series of Bulk Magnetic Phase Transitions in NaxCoO2: a muSR study

Abstract

Keywords

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