期刊
PHYSICAL REVIEW LETTERS
卷 106, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.067001
关键词
-
资金
- Department of Energy, Office of Basic Energy and Sciences [DE-AC02-76SF00515]
We measure the penetration depth lambda(ab)(T) in Ba(Fe1-xCox)(2)As-2 using local techniques that do not average over the sample. The superfluid density rho(s)(T) equivalent to 1/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.
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