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Resistivity, Hall effect and magnetoresistance have been investigatedsystematically on single crystals of Ba$_{1-x}$K$_x$Fe$_2$As$_2$ ranging fromundoped to optimally doped regions. A systematic evolution of the quasiparticlescattering has been observed. It is found that the resistivity in the normalstate of Ba$_{1-x}$K$_x$Fe$_2$As$_2$ is insensitive to the potassium dopingconcentration, which is very different from the electron doped counterpartBa(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$, where the resistivity at 300 K reduces tohalf value of the undoped one when the system is optimally doped. In starkcontrast, the Hall coefficient R$_H$ changes suddenly from a negative value inthe undoped sample to a positive one with slight K-doping, and it keepslowering with further doping. We interpret this dichotomy due to the asymmetricscattering rate in the hole and the electron pockets with much higher mobilityof the latter. The magnetoresistivity shows also a non-monotonic dopingdependence indicating an anomalous feature at about 80 K to 100 K, even in theoptimally doped sample, which is associated with a possible pseudogap feature.In the low temperature region, it seems that the resistivity has the similarvalues when superconductivity sets in disregarding the different T$_c$ values,which indicates a novel mechanism of the superconductivity. A linear feature ofresistivity $\rho_{ab}$ vs. $T$ was observed just above $T_c$ for the optimallydoped sample, suggesting a quantum criticality.

physical review. b, condensed matter and materials physics

Transport properties and asymmetric scattering in  Ba$_{1-x}$K$_x$Fe$_2$As$_2$ single crystals compared to the electron doped  counterparts Ba(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$}