Robust ${s}_{\pm}$ pairing in $\mathrm{CaK}{\left({\mathrm{Fe}}_{1\u2013x}{\mathrm{Ni}}_{x}\right)}_{4}{\mathrm{As}}_{4}$ ( $x=0$ and 0.05) from the response to electron irradiation
Abstract
Here, controlled pointlike disorder introduced by 2.5MeV electron irradiation was used to probe the superconducting state of single crystals of CaK(Fe_{1–x}Ni_{x})_{4}As_{4} superconductor at x = 0 and 0.05 doping levels. Both compositions show an increase of the residual resistivity and a decrease of the superconducting transition temperature, T_{c}, at the rate of dT_{c}/dρ(T_{c}) ≈ 0.19 K/(μΩcm) for x = 0 and 0.38 K/(μΩcm) for x = 0.05, respectively. In the Nidoped compound (x = 0.05), the coexisting spinvortex crystal (SVC) magnetic phase is suppressed at the rate of dT_{N}/dρ(T_{N}) ≈ 0.16 K/(μΩcm). The lowtemperature variation of London penetration depth is well approximated by the powerlaw function, Δλ(T) = AT^{n}, with n ≈ 2.5 for x = 0 and n ≈ 1.9 for x = 0.05 in the pristine state. Detailed analysis of λ(T) and T_{c} evolution with disorder is consistent with two effective nodeless energy gaps in the density of states due to robust s± pairing. Overall the behavior of CaK(Fe_{1–x}Ni_{x})_{4}As_{4} at x = 0 is similar to a slightly overdoped Ba_{1–y}K_{y}Fe_{2}As_{2} at y ≈ 0.5, and at x = 0.05 to an underdoped composition at y ≈ 0.2.
 Authors:

 Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
 Univ. ParisSaclay, Palaiseau Cedex (France)
 Publication Date:
 Research Org.:
 Ames Lab., Ames, IA (United States)
 Sponsoring Org.:
 USDOE
 OSTI Identifier:
 1439421
 Alternate Identifier(s):
 OSTI ID: 1434993
 Report Number(s):
 ISJ9672
Journal ID: ISSN 24699950; PRBMDO; TRN: US1900606
 Grant/Contract Number:
 AC0207CH11358; GBMF4411
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physical Review B
 Additional Journal Information:
 Journal Volume: 97; Journal Issue: 14; Journal ID: ISSN 24699950
 Publisher:
 American Physical Society (APS)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Teknowijoyo, S., Cho, K., Konczykowski, M., Timmons, E. I., Tanatar, M. A., Meier, W. R., Xu, M., Bud'ko, S. L., Canfield, P. C., and Prozorov, R. Robust s± pairing in CaK(Fe1–xNix)4As4 ( x=0 and 0.05) from the response to electron irradiation. United States: N. p., 2018.
Web. doi:10.1103/PhysRevB.97.140508.
Teknowijoyo, S., Cho, K., Konczykowski, M., Timmons, E. I., Tanatar, M. A., Meier, W. R., Xu, M., Bud'ko, S. L., Canfield, P. C., & Prozorov, R. Robust s± pairing in CaK(Fe1–xNix)4As4 ( x=0 and 0.05) from the response to electron irradiation. United States. https://doi.org/10.1103/PhysRevB.97.140508
Teknowijoyo, S., Cho, K., Konczykowski, M., Timmons, E. I., Tanatar, M. A., Meier, W. R., Xu, M., Bud'ko, S. L., Canfield, P. C., and Prozorov, R. Fri .
"Robust s± pairing in CaK(Fe1–xNix)4As4 ( x=0 and 0.05) from the response to electron irradiation". United States. https://doi.org/10.1103/PhysRevB.97.140508. https://www.osti.gov/servlets/purl/1439421.
@article{osti_1439421,
title = {Robust s± pairing in CaK(Fe1–xNix)4As4 ( x=0 and 0.05) from the response to electron irradiation},
author = {Teknowijoyo, S. and Cho, K. and Konczykowski, M. and Timmons, E. I. and Tanatar, M. A. and Meier, W. R. and Xu, M. and Bud'ko, S. L. and Canfield, P. C. and Prozorov, R.},
abstractNote = {Here, controlled pointlike disorder introduced by 2.5MeV electron irradiation was used to probe the superconducting state of single crystals of CaK(Fe1–xNix)4As4 superconductor at x = 0 and 0.05 doping levels. Both compositions show an increase of the residual resistivity and a decrease of the superconducting transition temperature, Tc, at the rate of dTc/dρ(Tc) ≈ 0.19 K/(μΩcm) for x = 0 and 0.38 K/(μΩcm) for x = 0.05, respectively. In the Nidoped compound (x = 0.05), the coexisting spinvortex crystal (SVC) magnetic phase is suppressed at the rate of dTN/dρ(TN) ≈ 0.16 K/(μΩcm). The lowtemperature variation of London penetration depth is well approximated by the powerlaw function, Δλ(T) = ATn, with n ≈ 2.5 for x = 0 and n ≈ 1.9 for x = 0.05 in the pristine state. Detailed analysis of λ(T) and Tc evolution with disorder is consistent with two effective nodeless energy gaps in the density of states due to robust s± pairing. Overall the behavior of CaK(Fe1–xNix)4As4 at x = 0 is similar to a slightly overdoped Ba1–yKyFe2As2 at y ≈ 0.5, and at x = 0.05 to an underdoped composition at y ≈ 0.2.},
doi = {10.1103/PhysRevB.97.140508},
journal = {Physical Review B},
number = 14,
volume = 97,
place = {United States},
year = {2018},
month = {4}
}
Web of Science
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