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Scaling of the temperature-dependent resistivity in 122 iron-pnictide superconductors

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In various electron-doped Ba(Fe1 − x Co x )2As2 (x = 0–0.3) and hole-doped Ba1 − x K x Fe2As2 (x = 0–1) members of the 122-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 formulae &\rho (T)=\rho_0+cT\exp (-\frac {2\Delta }{T}) ; and &\rho (T)=\rho_0+(c/T)\exp (-\frac {2\Delta }{T}) ; in the case of electron and hole doping, respectively. The scaling was performed using the energy scale 2Δ, c and the residual resistivity ρ0 as scaling parameters. The scaling parameters have been calculated and the compositional variation of 2Δ and ρ0 has been determined. The existence of universal metallic ρ(T) curves in Ba(Fe1 − x Co x )2As2 (x = 0–0.3) and Ba1 − x K x Fe2As2 (x = 0–1) is interpreted as an indication of a single mechanism in each compound which dominates the different scattering of the charge carriers in both compounds. 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 in both under-¬†and overdoped regimes.

Document Type: Research Article


Publication date: October 1, 2011

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