Neutron scattering study of novel magnetic order in Na0.5CoO2
G. Gasparovic, R. A. Ott, J. -H. Cho, F. C. Chou, Y. Chu, J. W. Lynn, Y. S. Lee
Abstract
We report polarized and unpolarized neutron scattering measurements of the magnetic order in single crystals of Na0.5CoO2. Our data indicate that below TN=88 K the spins form a novel antiferromagnetic pattern within the CoO2 planes, consisting of alternating rows of ordered and non-ordered Co ions. The domains of magnetic order are closely coupled to the domains of Na ion order, consistent with such a two-fold symmetric spin arrangement. Magnetoresistance and anisotropic susceptibility measurements further support this model for the electronic ground state.
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