Resistivity saturation in PrFeAsO${}_{1-x}$F${}_y$ superconductor: An evidence of strong electron-phonon coupling

Abstract

We have measured the resistivity of PrFeAsO${}_{1-x}$F${}_y$ samples over a wide range of temperature in order to elucidate the role of electron-phonon interaction on normal- and superconducting-state properties. The linear T dependence of $\rho$ above 170 K followed by a saturationlike behavior at higher temperature is a clear signature of strong electron-phonon coupling. From the analysis of T dependence of $\rho$, we have estimated several normal-state parameters useful for understanding the origin of superconductivity in this system. Our results suggest that Fe-based oxypnictides are phonon mediated BCS superconductors like Chevrel phases and A15 compounds.

15 pages, 4 figures

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Cited by in corpus (2)

• High - Temperature Superconductivity in Iron Based Layered Compounds
• Predictions of highest Transition-temperature for electron-phonon superconductors