Dimensional crossover and anomalous magnetoresistivity in single crystals $Na_xCoO_2$

Details Dimensional crossover and anomalous magnetoresistivity in single crystals $Na_xCoO_2$ Dimensional crossover and anomalous magnetoresistivity in single crystals $Na_xCoO_2$

2004-11-02

arxiv.org/abs/cond-mat/0411050v1

Phys. Rev. B 71, 224515 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.71.224515

The in-plane ($\rho_{ab}$) and c-axis ($\rho_c$) resistivities, and the magnetoresistivity of single crystals $Na_xCoO_2$ with x = 0.7, 0.5 and 0.3 were studied systematically. $\rho_{ab}(T)$ shows similar temperature dependence between $Na_{0.3}CoO_2$ and $Na_{0.7}CoO_2$, while $\rho_c(T)$ is quite different. A dimensional crossover from two to three occurs with decreasing Na concentration from 0.7 to 0.3. The angular dependence of in-plane magnetoresistivity for 0.5 sample shows a \emph{"d-wave-like"} symmetry at 2K, while the \emph{"p-wave-like"} symmetry at 20 K. These results give an evidence for existence of a \emph{spin ordering orientation} below 20 K turned by external field, like the stripes in cuprates.

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