Scaling of the Temperature Dependent Resistivity in 11 Iron-Pnictide Superconductors

In various $\mathrm{FeTe}_{1-x}\mathrm{Se}_{\mathrm{x}}$ (x=0?C1), members of the 11-iron-pnictide superconductor family, the temperature dependent resistivity ?? can be scaled into a universal curve. It?is found that the ??(T) dependences can be reproduced by the expressions $\rho(T) = \rho_{0} - (c/T)\exp( - \frac{2\varDelta }{T})$ and $\rho(T) =\rho_{0} + (c/T)\exp( - \frac{2\varDelta }{T})$ for x=0?C0.3 and 0.4?C1.0, respectively. The scaling was performed using the energy scale 2??, the parameter c, and the residual resistivity ?? ₀ as scaling parameters. The compositional variation of the scaling parameters 2?? and ?? ₀ has been determined. The existence of a universal metallic ??(T) curve is interpreted as an indication of a single mechanism which dominates the scattering of the charge carriers in FeTe_1?x Se _x (x=0?C1). Thus, the scaling of the normal-state properties seems to be a general feature not only for high-T _c cuprates but also for the iron-pnictides superconductor family.