Local measurement of the superfluid density in the pnictide superconductor Ba(Fe1-xCox2)As2 across the superconducting dome
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We measure the penetration depth λab(T) in Ba(Fe1-xCox)2As2 using local techniques that do not average over the sample. The superfluid density ρs(T)≡1/λab(T)2 has three main features. First, ρs(T=0) falls sharply on the underdoped side of the dome. Second, λab(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, ρs(T) varies steeply near Tc for optimal and underdoping. These observations are consistent with an interplay between magnetic and superconducting phases.
Luan , L , Lippman , T M , Hicks , C W , Bert , J A , Auslaender , O M , Chu , J-H , Analytis , J G , Fisher , I R & Moler , K A 2011 , ' Local measurement of the superfluid density in the pnictide superconductor Ba(Fe 1-x Cox 2 )As 2 across the superconducting dome ' Physical Review Letters , vol 106 , no. 6 , 067001 . DOI: 10.1103/PhysRevLett.106.067001
Physical Review Letters
© 2011 American Physical Society
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