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Resistivity under magnetic field, thermopower and Hall coefficient aresystematically 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 witha $T^2$ dependence below 30 K; while out-of-plane resistivity ($\rho_{c}(T)$)shows metallic behavior at high temperature and a thermal activationsemiconducting behavior below about 12 K. Striking feature is that magneticfield induces a ln(1/$T$) diverging behavior in both $\rho_{ab}$ and$\rho_{c}(T)$ at low temperature. The positive magnetoresistance (MR) could bewell fitted by the formula based on multi-band electronic structure. Theln(1/$T$) diverging behavior in $\rho_{ab}$ and $\rho_{c}(T)$ could arise fromthe magnetic-field-induced 2D weak localization or spin density wave.

journal of physics. condensed matter

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