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

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

2008-07-24

arxiv.org/abs/0807.3833v1

Physica C:Superconductivity,468,(2008),2275-2278

Physics

Condensed Matter

Superconductivity

14pages,4 Figures

Scientific paper

10.1016/j.physc.2008.07.006

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).

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