Physics – Condensed Matter – Superconductivity
Scientific paper
2010-12-15
Phys. Rev. Lett. 106, 067001 (2011)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1103/PhysRevLett.106.067001
We measure the penetration depth $\lambda_{ab}(T)$ in Ba(Fe$_{1-x}$Co$_{x}$)$_2$As$_2$ using local techniques that do not average over the sample. The superfluid density $\rho_s(T)\equiv1/\lambda_{ab}(T)^2$ has three main features. First, $\rho_s(T=0)$ falls sharply on the underdoped side of the dome. Second, $\lambda_{ab}(T)$ is flat at low $T$ at optimal doping, indicating fully gapped superconductivity, but varies more strongly in underdoped and overdoped samples, consistent with either a power law or a small second gap. Third, $\rho_s(T)$ varies steeply near $T_c$ for optimal and underdoping. These observations are consistent with an interplay between magnetic and superconducting phases.
Analytis James G.
Auslaender Ophir M.
Bert Julie A.
Chu Jiun-Haw.
Fisher Ian R.
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