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Evolution of London Penetration Depth with Scattering in Single Crystals of Ba₁₋ₓNaₓFe₂As₂
Physical Review B - Condensed Matter and Materials Physics
  • Hyunsoo Kim, Missouri University of Science and Technology
  • M. A. Tanatar
  • Yong Liu
  • Zachary Cole Sims
  • Chenglin Zhang
  • Pengcheng Dai
  • T. A. Lograsso
  • R. Prozorov
Abstract

London penetration depth, λ(T), was measured in single crystals ofK1-xNaxFe2As2, x = 0 and 0.07, down to temperatures of 50 mK, ~ Tc/50. Isovalent substitution of Na for K significantly increases impurity scattering, with ρ(Tc) rising from 0.2 to 2.2 µΩ cm, and leads to a suppression of Tc from 3.5 to 2.8 K. At the same time, a close to T-linear Δλ(T) in pure samples changes to almost T2 in the substituted samples. The behavior never becomes exponential as expected for the accidental nodes, as opposed to T2 dependence in superconductors with symmetry imposed line nodes. The superfluid density in the full temperature range follows a simple clean and dirty d-wave dependence, for pure and substituted samples, respectively. This result contradicts suggestions of multiband scenarios with strongly different gap structure on four sheets of the Fermi surface.

Department(s)
Physics
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2014 American Physical Society (APS), All rights reserved.
Publication Date
5-30-2014
Publication Date
30 May 2014
Disciplines
Citation Information
Hyunsoo Kim, M. A. Tanatar, Yong Liu, Zachary Cole Sims, et al.. "Evolution of London Penetration Depth with Scattering in Single Crystals of Ba₁₋ₓNaₓFe₂As₂" Physical Review B - Condensed Matter and Materials Physics Vol. 89 Iss. 17 (2014) ISSN: 1550-235X; 1098-0121
Available at: http://works.bepress.com/hyunsoo-kim/5/