Rxx(B = 0) as a function of T ranging from 4.2 to 80 K (black curve). The blue solid line denotes the theoretical VRH contribution described by Equation 3 and the red one corresponds to the activation part. Their sum is presented by the green dotted line. The inset shows lnG as a function of T−1/4.
Lo et al. Nanoscale Research Letters 2012 7:640 doi:10.1186/1556-276X-7-640