Doping evolution of the absolute value of the London penetration depth and superfluid density in single crystals of Ba(Fe1-xCox)2As2

The zero-temperature value of the in-plane London penetration depth, λab (0) , has been measured in single crystals of Ba(Fe1-x Cox)₂ As₂ as a function of the Co concentration, x , across both the underdoped and overdoped superconducting regions of the phase diagram. For x ≳ 0.047 , λab (0) has been...

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Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2010-08, Vol.82 (5)
Main Authors: Gordon, R. T., Kim, H., Salovich, N., Giannetta, R. W., Fernandes, R. M., Kogan, V. G., Prozorov, T., Bud’ko, S. L., Tanatar, M. A., Prozorov, R., Canfield, P. C.
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Language:English
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CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
energy storage (including batteries and capacitors)
phonons
spin dynamics
superconductivity, defects
thermal conductivity
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container_issue 5
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container_title Physical review. B, Condensed matter and materials physics
container_volume 82
creator Gordon, R. T.
Kim, H.
Salovich, N.
Giannetta, R. W.
Fernandes, R. M.
Kogan, V. G.
Prozorov, T.
Bud’ko, S. L.
Tanatar, M. A.
Prozorov, R.
Canfield, P. C.
description The zero-temperature value of the in-plane London penetration depth, λab (0) , has been measured in single crystals of Ba(Fe1-x Cox)₂ As₂ as a function of the Co concentration, x , across both the underdoped and overdoped superconducting regions of the phase diagram. For x ≳ 0.047 , λab (0) has been found to have values between 120 ± 50 and 300 ± 50 nm . A pronounced increase in λab (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 λab (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.
doi_str_mv 10.1103/PhysRevB.82.054507
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subjects CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
energy storage (including batteries and capacitors)
phonons
spin dynamics
superconductivity, defects
thermal conductivity
title Doping evolution of the absolute value of the London penetration depth and superfluid density in single crystals of Ba(Fe1-xCox)2As2
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