Unusual Temperature and Field Dependence of Transport Properties Ba(Fe1-xCox)2As2

The in-plane transport properties of Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ single crystals with x = 0.02 $\sim$ 0.28 was measured as a function of temperature (2 $\sim$ 300 K) and magnetic field (up to 14 Tesla). A Cobalt doping composition-temperature (x-T) phase diagram was plotted and shows a non-Fermi liquid (NFL) transport behavior around the optimal doing level. The Hall effect and magneto-resistance results also show an anomaly and a change of field dependence around the optimal doing. The underlying physics of such unusual temperature and field dependence of transport properties $ab$ plane will be discussed.