Analysis of the London penetration depth in Ni-doped
Abstract
We report combined experimental and theoretical analysis of superconductivity in CaK(Fe1-xNix)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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1566846
- Alternate Identifier(s):
- OSTI ID: 1560772
- Report Number(s):
- IS-J 10043
Journal ID: ISSN 2469-9950; PRBMDO
- Grant/Contract Number:
- AC02-07CH11358; GBMF4411
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 100; Journal Issue: 9; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
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., and Prozorov, R. Analysis of the London penetration depth in Ni-doped CaKFe4As4. United States: N. p., 2019.
Web. doi:10.1103/PhysRevB.100.094513.
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. Analysis of the London penetration depth in Ni-doped CaKFe4As4. United States. https://doi.org/10.1103/PhysRevB.100.094513
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., and Prozorov, R. Sun .
"Analysis of the London penetration depth in Ni-doped CaKFe4As4". United States. https://doi.org/10.1103/PhysRevB.100.094513. https://www.osti.gov/servlets/purl/1566846.
@article{osti_1566846,
title = {Analysis of the London penetration depth in Ni-doped CaKFe4As4},
author = {Torsello, D. and Cho, K. and Joshi, K. R. and Ghimire, S. and Ummarino, G. A. and Nusran, N. M. and Tanatar, M. A. and Meier, W. R. and Xu, M. and Bud'ko, S. L. and Canfield, P. C. and Ghigo, G. and Prozorov, R.},
abstractNote = {We report combined experimental and theoretical analysis of superconductivity in CaK(Fe1-xNix)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.},
doi = {10.1103/PhysRevB.100.094513},
journal = {Physical Review B},
number = 9,
volume = 100,
place = {United States},
year = {Sun Sep 01 00:00:00 EDT 2019},
month = {Sun Sep 01 00:00:00 EDT 2019}
}
Web of Science
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