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Anisotropy induced vortex lattice rearrangement in CaKFe4As4
Ames Laboratory Accepted Manuscripts
  • Rustem Khasanov, Paul Scherrer Institut
  • William R. Meier, Iowa State University and Ames Laboratory
  • Sergey L. Bud’ko, Iowa State University and Ames Laboratory
  • Hubertus Luetkens, Paul Scherrer Institut
  • Paul C. Canfield, Iowa State University and Ames Laboratory
  • Alex Amato, Paul Scherrer Institut
Publication Date
Ames Laboratory; Physics and Astronomy
Report Number
IS-J 9888
Journal Title
Physical Review B

The magnetic penetration depth anisotropy gamma(lambda) = lambda(c)/lambda(ab) (lambda(ab) and lambda(c) are the in-plane and the out-of-plane components of the magnetic penetration depth) in a CaKFe4As4 single crystal sample (the critical temperature T-c similar or equal to 35 K) was studied by means of muon-spin rotation (mu SR). gamma(lambda) is almost temperature independent for T less than or similar to 20 K (gamma(lambda) similar or equal to 1.9) and it reaches similar or equal to 3.0 by approaching T-c. The change of gamma(lambda) induces the corresponding rearrangement of the flux line lattice (FLL), which is clearly detected via enhanced distortions of the FLL mu SR response. A comparison of gamma(lambda) with the anisotropy of the upper critical field (gamma H-c2) studied by Meier et al. [Phys. Rev. B 94, 064501 (2016)] reveals that gamma(lambda) is systematically higher than gamma H(c2 )at low temperatures and approaches gamma H-c2 for T -> T-c. The anisotropic properties of lambda are explained by the multigap nature of superconductivity in CaKFe4As4 and are caused by anisotropic contributions of various bands to the in-plane and the out-of-plane components of the superfluid density.

DOE Contract Number(s)
GBMF4411; AC02-07CH11358
Iowa State University Digital Repository, Ames IA (United States)
Citation Information
Rustem Khasanov, William R. Meier, Sergey L. Bud’ko, Hubertus Luetkens, et al.. "Anisotropy induced vortex lattice rearrangement in CaKFe4As4" Vol. 99 Iss. 14 (2019) p. 140507(R)
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