Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

8-1-2010

Journal or Book Title

Physical Review B

Volume

82

Issue

5

First Page

054507

DOI

10.1103/PhysRevB.82.054507

Abstract

The zero-temperature value of the in-plane London penetration depth, λab(0), has been measured in single crystals of Ba(Fe1−xCox)2As2 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.

Comments

This article is published as Gordon, R. T., H. Kim, N. Salovich, Russell W. Giannetta, R. M. Fernandes, V. G. Kogan, T. Prozorov, S. L. Bud’ko, P. C. Canfield, M. A. Tanatar, and R. Prozorov. "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." Physical Review B 82, no. 5 (2010): 054507. DOI: 10.1103/PhysRevB.82.054507. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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