Tuning the Intrinsic Anisotropy with Disorder in the CaKFe4As4 Superconductor

Torsello, D.; Ummarino, G. A.; Bekaert, J.; Gozzelino, L.; Gerbaldo, R.; Tanatar, M. A.; Canfield, P. C.; Prozorov, R.; Ghigo, G.

doi:10.1103/PhysRevApplied.13.064046

Tuning the Intrinsic Anisotropy with Disorder in the ${Ca K Fe}_{4} {As}_{4}$ Superconductor

Journal Article · Thu Jun 18 00:00:00 EDT 2020 · Physical Review Applied

DOI:https://doi.org/10.1103/PhysRevApplied.13.064046· OSTI ID:1635641

^[1]; ^[2]; ^[3]; ^[1]; Gerbaldo, R. ^[1]; ^[4]; ^[4]; ^[4]; ^[1]

Politecnico di Torino (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Torino (Italy)
Politecnico di Torino (Italy); National Research Nuclear Univ. (MEPhI), Moskva (Russia)
Univ. of Antwerp (Belgium)
Ames Lab., and Iowa State Univ., Ames, IA (United States)

In this paper, we report on the anisotropy of the London penetration depth of CaKFe₄As₄, discussing how it relates to its electronic structure and how it modifies under introduction of disorder, both chemically induced (by Ni substitution) and irradiation induced (by 3.5-MeV protons). Indeed, CaKFe₄As₄ is particularly suitable for the study of fundamental superconducting properties due to its stoichiometric composition, exhibiting clean-limit behavior in the pristine samples and having a fairly high critical temperature, T_c≈35 K. The London penetration depth λ_L is measured with a microwave-coplanar-resonator technique that allows us to deconvolve the anisotropic contributions λ_L,ab and λ_L,c and obtain the anisotropy parameter γλ=λ_L,c/λ_L,ab. The γλ(T) found for the undoped pristine sample is in good agreement with previous literature and is here compared to ab initio density-functional-theory and Eliashberg calculations. The dependence of γλ(T) on both chemical and irradiation-induced disorder is discussed to highlight which method is more suitable to decrease the direction dependence of the electromagnetic properties while maintaining a high critical temperature. Lastly, the relevance of an intrinsic anisotropy such as γλ on application-related anisotropic parameters (critical current, pinning) is discussed in light of the recent employment of CaKFe₄As₄ in the production of wires.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: Italian Ministry of Education, University and Research; MEPhI Academic Excellence Project; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1635641

Report Number(s):: IS-J--10,255

Journal Information:: Physical Review Applied, Journal Name: Physical Review Applied Journal Issue: 6 Vol. 13; ISSN 2331-7019; ISSN PRAHB2

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Tuning the Intrinsic Anisotropy with Disorder in the CaKFe4 As4 Superconductor

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Tuning the Intrinsic Anisotropy with Disorder in the ${Ca K Fe}_{4} {As}_{4}$ Superconductor