Bulk antiferromagnetism in $\bf Na_{0.82}CoO_2$ single crystals

Details Bulk antiferromagnetism in $\bf Na_{0.82}CoO_2$ single crystals Bulk antiferromagnetism in $\bf Na_{0.82}CoO_2$ single crystals

2003-12-15

arxiv.org/abs/cond-mat/0312376v2

Phys. Rev. B 69, 100410(R) (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

published version

Scientific paper

10.1103/PhysRevB.69.100410

Susceptibility, specific heat, and muon spin rotation measurements on high-quality single crystals of $\rm Na_{0.82}CoO_2$ have revealed bulk antiferromagnetism with N\'{e}el temperature $\rm T_N = 19.8 \pm 0.1$ K and an ordered moment perpendicular to the $\rm CoO_2$ layers. The magnetic order encompasses nearly 100% of the crystal volume. The susceptibility exhibits a broad peak around 30 K, characteristic of two-dimensional antiferromagnetic fluctuations. The in-plane resistivity is metallic at high temperatures and exhibits a minimum at $\rm T_N$.

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