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Title: Nodeless multiband superconductivity in stoichiometric single-crystalline CaKFe 4 As 4

Measurements of the London penetration depth Δλ(T) and tunneling conductance in single crystals of the recently discovered stoichiometric iron-based superconductor CaKFe 4As 4 (CaK1144) show nodeless, two-effective-gap superconductivity with a larger gap of about 6–10 meV and a smaller gap of about 1–4 meV. Having a critical temperature T c,onset ≈ 35.8 K, this material behaves similar to slightly overdoped (Ba 1–xK x)Fe 2As 2 (e.g., x = 0.54,T c ≈ 34 K), a known multigap s ± superconductor. Here, we conclude that the superconducting behavior of stoichiometric CaK1144 demonstrates that two-gap s± superconductivity is an essential property of high-temperature superconductivity in iron-based superconductors, independent of the degree of substitutional disorder.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [1] ;  [1] ;  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Univ. Autonoma de Madrid, Madrid (Spain)
Publication Date:
Report Number(s):
IS-J-9232
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1700632
Grant/Contract Number:
AC02-07CH11358; 679080; GBMF4411
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 10; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1350068
Alternate Identifier(s):
OSTI ID: 1346271

Cho, Kyuil, Fente, A., Teknowijoyo, S., Tanatar, M. A., Joshi, K. R., Nusran, N. M., Kong, T., Meier, W. R., Kaluarachchi, U., Guillamón, I., Suderow, H., Bud'ko, S. L., Canfield, P. C., and Prozorov, R.. Nodeless multiband superconductivity in stoichiometric single-crystalline CaKFe4As4. United States: N. p., Web. doi:10.1103/PhysRevB.95.100502.
Cho, Kyuil, Fente, A., Teknowijoyo, S., Tanatar, M. A., Joshi, K. R., Nusran, N. M., Kong, T., Meier, W. R., Kaluarachchi, U., Guillamón, I., Suderow, H., Bud'ko, S. L., Canfield, P. C., & Prozorov, R.. Nodeless multiband superconductivity in stoichiometric single-crystalline CaKFe4As4. United States. doi:10.1103/PhysRevB.95.100502.
Cho, Kyuil, Fente, A., Teknowijoyo, S., Tanatar, M. A., Joshi, K. R., Nusran, N. M., Kong, T., Meier, W. R., Kaluarachchi, U., Guillamón, I., Suderow, H., Bud'ko, S. L., Canfield, P. C., and Prozorov, R.. 2017. "Nodeless multiband superconductivity in stoichiometric single-crystalline CaKFe4As4". United States. doi:10.1103/PhysRevB.95.100502. https://www.osti.gov/servlets/purl/1350068.
@article{osti_1350068,
title = {Nodeless multiband superconductivity in stoichiometric single-crystalline CaKFe4As4},
author = {Cho, Kyuil and Fente, A. and Teknowijoyo, S. and Tanatar, M. A. and Joshi, K. R. and Nusran, N. M. and Kong, T. and Meier, W. R. and Kaluarachchi, U. and Guillamón, I. and Suderow, H. and Bud'ko, S. L. and Canfield, P. C. and Prozorov, R.},
abstractNote = {Measurements of the London penetration depth Δλ(T) and tunneling conductance in single crystals of the recently discovered stoichiometric iron-based superconductor CaKFe4As4 (CaK1144) show nodeless, two-effective-gap superconductivity with a larger gap of about 6–10 meV and a smaller gap of about 1–4 meV. Having a critical temperature Tc,onset ≈ 35.8 K, this material behaves similar to slightly overdoped (Ba1–xKx)Fe2As2 (e.g., x = 0.54,Tc ≈ 34 K), a known multigap s± superconductor. Here, we conclude that the superconducting behavior of stoichiometric CaK1144 demonstrates that two-gap s± superconductivity is an essential property of high-temperature superconductivity in iron-based superconductors, independent of the degree of substitutional disorder.},
doi = {10.1103/PhysRevB.95.100502},
journal = {Physical Review B},
number = 10,
volume = 95,
place = {United States},
year = {2017},
month = {3}
}