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

Gordon, R. T.; Kim, H.; Salovich, N.; Giannetta, R. W.; Fernandes, R. M.; Kogan, V. G.; Prozorov, T.; Bud’ko, S. L.; Canfield, P. C.; Tanatar, M. A.; Prozorov, R.

doi:10.1103/PhysRevB.82.054507

Doping evolution of the absolute value of the London penetration depth and superfluid density in single crystals of $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$

Journal Article · Sun Aug 01 04:00:00 EDT 2010 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.82.054507· OSTI ID:1385907

Gordon, R. T.; Kim, H.; Salovich, N.; Giannetta, R. W.; Fernandes, R. M.; Kogan, V. G.; Prozorov, T.; Bud’ko, S. L.; Canfield, P. C.; Tanatar, M. A.; Prozorov, R.

The zero-temperature value of the in-plane London penetration depth, λ a b ( 0 ) , has been measured in single crystals of Ba ( Fe 1 - x Co x ) 2 As 2 as a function of the Co concentration, x , across both the underdoped and overdoped superconducting regions of the phase diagram. For x ≳ 0.047 , λ a b ( 0 ) has been found to have values between 120 ± 50 and 300 ± 50 nm . A pronounced increase in λ a b ( 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 λ a b ( 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.

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)

Sponsoring Organization:: USDOE SC Office of Basic Energy Sciences (SC-22)

DOE Contract Number:: AC02-98CH10886

OSTI ID:: 1385907

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 5 Vol. 82; ISSN 1098-0121; ISSN PRBMDO

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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