Abstract
We measured the surface impedance of NaFe1−xCoxAs (x≈0.03, optimally doped) single crystals under finite magnetic fields. At low temperatures (T<0.5Tc), the penetration depth of these crystals was increased as λ(T)−λ(0)=A×Tn with an exponent n≈2, indicating the realization of the gapless superconductivity. The flux-flow resistivity, ρf, behaved similarly to the Bardeen–Stephen prediction, ρf/ρn=B/Bc2. However, the electronic state inside the vortex core was not so dirty. By comparing the results with those of LiFeAs1−xPx and SrFe2(As0.7P0.3)2, it has been clarified that the gap anisotropy dominates the gradient of ρf(B).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
