Disorder-Driven Transition from s± to s++ Superconducting Order Parameter in Proton Irradiated Ba(Fe1-xRhx)2As2 Single Crystals

Ghigo, Gianluca; Torsello, D.; Ummarino, G. A.; Gozzelino, L.; Tanatar, M. A.; Prozorov, R.; Canfield, P. C.

doi:10.1103/PhysRevLett.121.107001

Disorder-Driven Transition from $s_{\pm}$ to $s_{+ +}$ Superconducting Order Parameter in Proton Irradiated $Ba ({Fe}_{1 - x} {Rh}_{x})_{2} {As}_{2}$ Single Crystals

Journal Article · Tue Sep 04 00:00:00 EDT 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.121.107001· OSTI ID:1471223

Ghigo, Gianluca ^[1]; Torsello, D. ^[1]; Ummarino, G. A. ^[2]; Gozzelino, L. ^[1]; Tanatar, M. A. ^[3]; Prozorov, R. ^[3]; Canfield, P. C. ^[3]

Politecnico di Torino, Torino (Italy); Istituto Nazionale di Fisica Nucleare, Torino (Italy)
Politecnico di Torino, Torino (Italy); National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moskva (Russia)
Ames Lab. and Iowa State Univ., Ames, IA (United States)

Here, 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(Fe_1–xRh_x)₂As₂ single crystals, where disorder was induced by means of 3.5 MeV proton irradiation. Signatures of such a transition, as theoretically predicted, 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.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1471223

Alternate ID(s):: OSTI ID: 1468839

Report Number(s):: IS-J--9753

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 121; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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