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Upper critical field of NaFe1−xCox as superconductors
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Ghannadzadeh, S., Wright, J. D., Foronda, F. R., Blundell, S. J., Clarke, S. J. and Goddard, Paul (2014) Upper critical field of NaFe1−xCox as superconductors. Physical Review B (Condensed Matter and Materials Physics), Volume 89 (Number 5). Article number 054502 . doi:10.1103/PhysRevB.89.054502 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.89.054502
Abstract
The upper critical field of NaFe1−xCoxAs was measured from x=0 to x=0.08, with the magnetic field applied parallel (H∥c2) and normal (H⊥c2) to the planes. The data were fitted using one-band and two-band models. The orbital and paramagnetic components of the upper critical field were extracted for H∥c2, which we find to be strongly dominated by paramagnetic pair breaking. In the parent compound the paramagnetic limit is equal to the value expected by BCS theory. However, substitution of Fe by Co leads to an enhancement above the BCS limit by a factor of approximately 1.6. In the overdoped region, we observe a significant convex curvature in H⊥c2 at low temperatures, which we attribute to the two-band nature of the superconductivity and the asymmetry between the two bands. Additionally, we discuss the behavior of critical field anisotropy, coherence length ξ, and the penetration depth λ.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||||
Publisher: | American Physical Society | ||||||
ISSN: | 1098-0121 | ||||||
Official Date: | 7 February 2014 | ||||||
Dates: |
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Volume: | Volume 89 | ||||||
Number: | Number 5 | ||||||
Article Number: | Article number 054502 | ||||||
DOI: | 10.1103/PhysRevB.89.054502 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Restricted or Subscription Access |
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