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

B. Keimer; C. Bernhard; C. Niedermayer; C. T. Lin; D. P. Chen; J. Strempfer; P. Lemmens; R. K. Kremer; S. Bayrakci

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Bulk antiferromagnetism in bf Na_(0.82)CoO₂ single crystals

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arxiv cond-mat/0312376 v2 pith:EKXEKYIK submitted 2003-12-15 cond-mat.str-el cond-mat.supr-con

Bulk antiferromagnetism in bf Na_(0.82)CoO₂ single crystals

S. Bayrakci , C. Bernhard , D. P. Chen , B. Keimer , R. K. Kremer , P. Lemmens , C. T. Lin , C. Niedermayer

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J. Strempfer

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keywords antiferromagnetismbulkcrystalsexhibitssinglesusceptibilityantiferromagneticaround

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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 $\rm T_N$.

Bulk antiferromagnetism in bf Na_(0.82)CoO₂ single crystals

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