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

Abstract

In various FeTe 1−x Se x (x = 0-1), members of the 11-iron-pnictide superconductor family, the temperature dependent resistivity ρ can be scaled into a universal curve. It is found that the ρ(T ) dependences can be reproduced by the expressionsT ) for x = 0-0.3 and 0.4-1.0, respectively. The scaling was performed using the energy scale 2Δ, the parameter c, and the residual resistivity ρ 0 as scaling parameters. The compositional variation of the scaling parameters 2Δ and ρ 0 has been determined. The existence of a universal metallic ρ(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 = 0-1). 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.