Slope of the upper critical field at Tc in two-band superconductors with nonmagnetic disorder: s++ superconductivity in Ba1−xKxFe2As2

Prozorov, R.; Kogan, V. G.; Kończykowski, M.; Tanatar, M. A.

doi:10.1103/physrevb.109.024506

Slope of the upper critical field at Tc in two-band superconductors with nonmagnetic disorder: s ++ superconductivity in Ba 1−x Kx Fe2 As2

Journal Article · Tue Jan 09 23:00:00 EST 2024 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.109.024506· OSTI ID:2281349

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Ames Laboratory (AMES), Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
Ames Laboratory (AMES), Ames, IA (United States)
Ecole Polytechnique (France); Centre National de la Recherche Scientifique (CNRS) (France); Alternative Energies and Atomic Energy Commission (CEA) (France)

A recent theory of the disorder-dependent slope of the upper critical field at the superconducting transition temperature T_c, defined as S ≡ |dH_c2/dT|_{T→T_c}, is extended to multiband superconductors aimed at iron-based superconductors, considering two constant gaps of different magnitudes and, potentially, different signs. Here, we show that the slope S decreases with increasing nonmagnetic scattering rate P in the s_± pairing state and increases in the s₊₊ superconductor for a reasonable range of parameters. The experiment shows that in a typical iron-based superconductor, Ba_1–xK_xFe₂As₂ (BaK122), the nonmagnetic disorder induced by electron irradiation leads to an increasing S(P) across the superconducting “dome,” at different x. This implies that Ba_1–xK_xFe₂As₂ is likely an s₊₊ superconductor with two effective gaps of different magnitudes, at least at moderate doping levels, x< 0.6. This work reopens a decade-long discussion about the nature of the superconducting order parameter in iron pnictides.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 2281349

Alternate ID(s):: OSTI ID: 2473568

Report Number(s):: IS-J--11,231

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 2 Vol. 109; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Slope of the upper critical field at Tc in two-band superconductors with nonmagnetic disorder: s ++ superconductivity in Ba 1−x Kx Fe2 As2

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