Journal
PHYSICAL REVIEW LETTERS
Volume 121, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.107001
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Funding
- U.S. Department of Energy, Office of Basic Energy Science, Division of Materials Sciences and Engineering
- U.S. Department of Energy [DE-AC02-07CH11358]
- MEPhI Academic Excellence Project [02.a03.21.0005]
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Microwave measurements of the London penetration depth and critical temperature T-c were used to show evidence of a disordered-driven transition from s(+/-) to s(++) order parameter symmetry in optimally doped Ba(Fe1-xRhx)(2) As-2 single crystals, where disorder was induced by means of 3.5 MeV proton irradiation. Signatures of such a transition, as theoretically predicted [V.D. Efremov et al., Phys. Rev. B 84, 180512(R) (2011)], are found as a drop in the low-temperature values of the London penetration depth and a virtually disorder-independent superconducting T-c. We show how these experimental observations can be described by multiband Eliashberg calculations in which the effect of disorder is accounted for in a suitable way. To this aim, an effective two-band approach is adopted, allowing us to treat disorder in a range between the Born approximation and the unitary limit.
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