Neutron scattering study of novel magnetic order in Na0.5CoO2

Details Neutron scattering study of novel magnetic order in Na0.5CoO2 Neutron scattering study of novel magnetic order in Na0.5CoO2

2005-08-05

arxiv.org/abs/cond-mat/0508158v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.96.046403

We report polarized and unpolarized neutron scattering measurements of the magnetic order in single crystals of Na0.5CoO2. Our data indicate that below T_N=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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