Transport properties and magnetic field induced localization in the misfit cobaltite [Bi${}_2$Ba${}_{1.3}$K${}_{0.6}$Co${}_{0.1}$]${}^{RS}$[CoO${}_2$]${}_{1.97}$ single crystal

Abstract

Resistivity under magnetic field, thermopower and Hall coefficient are systematically studied for [Bi${}_2$Ba${}_{1.3}$K${}_{0.6}$Co${}_{0.1}$]${}^{RS}$[CoO${}_2$]${}_{1.97}$ single crystal. In-plane resistivity (${\rho }_{ab}$(T)) shows metallic behavior down to 2 K with a $T^2$ dependence below 30 K; while out-of-plane resistivity (${\rho }_c(T)$) shows metallic behavior at high temperature and a thermal activation semiconducting behavior below about 12 K. Striking feature is that magnetic field induces a ln(1/$T$) diverging behavior in both ${\rho }_{ab}$ and ${\rho }_c(T)$ at low temperature. The positive magnetoresistance (MR) could be well fitted by the formula based on multi-band electronic structure. The ln(1/$T$) diverging behavior in ${\rho }_{ab}$ and ${\rho }_c(T)$ could arise from the magnetic-field-induced 2D weak localization or spin density wave.

7 pages, 8 figures

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Cited by in corpus (1)

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