Analysis of the London penetration depth in Ni-doped CaKFe4As4

Torsello, D.; Cho, K.; Joshi, K. R.; Ghimire, S.; Ummarino, G. A.; Nusran, N. M.; Tanatar, M. A.; Meier, W. R.; Xu, M.; Bud'ko, S. L.; Canfield, P. C.; Ghigo, G.; Prozorov, R.

doi:10.1103/PhysRevB.100.094513

Title: Analysis of the London penetration depth in Ni-doped ${CaKFe}_{4} {As}_{4}$

Journal Article · Sun Sep 01 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.100.094513· OSTI ID:1566846

^[1]; Cho, K. ^[2]; Joshi, K. R. ^[3]; Ghimire, S. ^[3]; Ummarino, G. A. ^[4]; Nusran, N. M. ^[3]; Tanatar, M. A. ^[3]; Meier, W. R. ^[3]; Xu, M. ^[3]; Bud'ko, S. L. ^[3]; Canfield, P. C. ^[3]; Ghigo, G. ^[5]; Prozorov, R. ^[3]

Politecnico di Torino, Torino (Italy). Dept. of Applied Science and Technology; Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Torino (Italy); Ames Lab., Ames, IA (United States)
Ames Lab., Ames, IA (United States)
Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
Politecnico di Torino, Torino (Italy). Dept. of Applied Science and Technology; Moscow Engineering Physics Univ., Moscow (Russian Federation)
Politecnico di Torino, Torino (Italy). Dept. of Applied Science and Technology; Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Torino (Italy)

We report combined experimental and theoretical analysis of superconductivity in CaK(Fe_1-xNi_x)₄As₄ (CaK1144) for $x = 0$, 0.017, and 0.034. To obtain the superfluid density $$ρ = [1 + Δλ_L$$($$T$)/$$λ_L(0)]^{-2}$$, the temperature dependence of the London penetration depth $$Δλ_L$$ ($$T$$) was measured by using a tunnel-diode resonator (TDR) and the results agreed with the microwave coplanar resonator (MWR) with the small differences accounted for by considering a three orders of magnitude higher frequency of MWR. The absolute value of $$λ_L (T«T_c) ≈ λ_L (0)$$ was measured by using MWR, $$λ_L (5 K) ≈ 170 ± 20$$ nm, which agreed well with the NV centers in diamond optical magnetometry that gave $$λ_L (5 K) ≈ 196 ± 12$$ nm. The experimental results are analyzed within the Eliashberg theory, showing that the superconductivity of CaK1144 is well described by the nodeless $$s_±$$ order parameter and that upon Ni doping the interband interaction increases.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358; GBMF4411

OSTI ID:: 1566846

Alternate ID(s):: OSTI ID: 1560772

Report Number(s):: IS-J 10043; PRBMDO

Journal Information:: Physical Review B, Vol. 100, Issue 9; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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References (49)

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