Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-01-10
Phys. Rev. Lett. 94, 136403 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
Sumitted to Phys. Rev. Lett., 1 Oct 2004, revised version
Scientific paper
10.1103/PhysRevLett.94.136403
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.
Alloul Henri
Amato Alessandro
Bert Fabrice
Blanchard Nicole
Bobroff Julien
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