Nodeless multiband superconductivity in stoichiometric single-crystalline CaKFe4As4

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.

doi:10.1103/PhysRevB.95.100502

Nodeless multiband superconductivity in stoichiometric single-crystalline ${CaKFe}_{4} {As}_{4}$

Journal Article · Wed Mar 08 00:00:00 EST 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.95.100502· OSTI ID:1350068

Cho, Kyuil ^[1]; Fente, A. ^[2]; Teknowijoyo, S. ^[1]; Tanatar, M. A. ^[1]; Joshi, K. R. ^[1]; Nusran, N. M. ^[1]; Kong, T. ^[1]; Meier, W. R. ^[1]; Kaluarachchi, U. ^[1]; Guillamón, I. ^[2]; Suderow, H. ^[2]; Bud'ko, S. L. ^[1]; Canfield, P. C. ^[1]; Prozorov, R. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States)
Univ. Autonoma de Madrid, Madrid (Spain)

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 T_c,onset ≈ 35.8 K, this material behaves similar to slightly overdoped (Ba_1–xK_x)Fe₂As₂ (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.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1350068

Alternate ID(s):: OSTI ID: 1346271

Report Number(s):: IS-J--9232

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 10 Vol. 95; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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