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

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

Research output: Contribution to journalArticle

Abstract

The zero-temperature value of the in-plane London penetration depth, λab (0), has been measured in single crystals of Ba (Fe 1-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±50nm. A pronounced increase in λab (0), to a value as high as 950±50nm, 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.

Original languageEnglish (US)
Article number054507
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number5
DOIs
StatePublished - Aug 6 2010

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    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. (2010). Doping evolution of the absolute value of the London penetration depth and superfluid density in single crystals of Ba ( Fe1-x Co x)2 As2. Physical Review B - Condensed Matter and Materials Physics, 82(5), [054507]. https://doi.org/10.1103/PhysRevB.82.054507