Muon-spin rotation studies of SmFeAsO0.85 and NdFeAsO0.85 superconductors
Abstract
Measurements of the in-plane magnetic field penetration depth λab in Fe-based superconductors with the nominal composition SmFeAsO0.85 (Tc52K) and NdFeAsO0.85 (Tc51K) were carried out by means of muon-spin-rotation. The absolute values of λab at T=0 were found to be 189(5)nm and 195(5)nm for Sm and Nd substituted samples, respectively. The analysis of the magnetic penetration depth data within the Uemura classification scheme, which considers the correlation between the superconducting transition temperature Tc and the effective Fermi temperature TF, reveal that both families of Fe-based superconductors (with and without fluorine) falls to the same class of unconventional superconductors.
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