Journal
PHYSICAL REVIEW B
Volume 82, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.054507
Keywords
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Funding
- division of Materials Science and Engineering, Basic Energy Sciences, Department of Energy (US DOE) [DEAC02-07CH11358, DE-AC0298CH1088]
- Alfred P. Sloan Foundation
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The zero-temperature value of the in-plane London penetration depth, lambda(ab)(0), has been measured in single crystals of Ba(Fe1-xCox)(2)As-2 as a function of the Co concentration, x, across both the underdoped and over-doped superconducting regions of the phase diagram. For x >= 0.047, lambda(ab)(0) has been found to have values between 120+/-50 and 300+/-50 nm. A pronounced increase in lambda(ab)(0), to a value as high as 950+/-50 nm, has been observed for x <= 0.047, corresponding to the region of the phase diagram where the itinerant antiferromagnetic and superconducting phases coexist and compete. Direct determination of the doping-dependent lambda(ab)(0) has allowed us to track the evolution of the temperature-dependent superfluid density, from which we infer the development of a pronounced superconducting gap anisotropy at the edges of the superconducting dome.
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