Effects of Ru Doping on the Transport Behavior and Superconducting Transition Temperature of NdFeAsO0.89F0.11

TL;DR

This study investigates how Ru doping affects the transport properties and superconducting transition temperature of NdFeAsO0.89F0.11, revealing minimal Tc suppression and supporting the robustness of superconductivity against nonmagnetic impurities.

Contribution

It demonstrates that Ru doping causes negligible Tc suppression, challenging the pair-breaking explanation for nonmagnetic impurities in this superconductor.

Findings

Ru doping has a minimal effect on Tc.

The suppression rate of Tc is too small to be explained by pair breaking.

Results support the robustness of superconductivity against nonmagnetic impurities.

Abstract

The transport behavior and superconducting transition temperature Tc of NdFe1-yRuyAsO0.89F0.11 have been studied for various y values. Because Ru impurities are isoelectronic to host Fe atoms, we basically expect that the number of electrons does not change with y, at least in the region of small y values. The results indicate that the rate of Tc suppression by Ru atoms is too small to be explained by the pair breaking effect of nonmagnetic impurities expected for the S+- symmetry, confirming our previous results for Co doping.