Normal-state transport properties of PrFeAsO${}_{1-x}$F${}_y$ superconductor

Abstract

We have synthesized oxygen-deficient fluorine-doped samples of nominal composition PrFeAsO${}_{1-x}$F${}_y$ to study the normal and superconducting state properties. Resistivity of undoped PrFeAsO exhibits a strong anomaly at around 155 K due to the spin-density-wave instability. Fluorine doping ($x$=0.4, $y$=0.12) suppresses this magnetic instability and drives the system to the superconducting ground state with superconducting onset temperature 50 K. The behavior of normal-state resistivity changes from $T^2$-like to $T$-linear to sublinear in $T$ with increasing temperature indicating that both electron-electron interaction and electron-phonon interaction are strong. From the analysis of $T$ dependence of $\rho$, we have estimated the electron-phonon coupling strength ($\lambda$) to be quite large (1.3).

14pages,4 Figures

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Cited by in corpus (1)

• Valley density-wave and multiband superconductivity in Fe-pnictides