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Title: Disorder-Driven Transition from s ± to s + + Superconducting Order Parameter in Proton Irradiated Ba ( Fe 1 - x Rh x ) 2 As 2 Single Crystals

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) 2As 2 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.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [3] ;  [3]
  1. Politecnico di Torino, Torino (Italy); Istituto Nazionale di Fisica Nucleare, Torino (Italy)
  2. Politecnico di Torino, Torino (Italy); National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moskva (Russia)
  3. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Report Number(s):
IS-J-9753
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:
AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 121; Journal Issue: 10; Journal ID: ISSN 0031-9007
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:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1471223
Alternate Identifier(s):
OSTI ID: 1468839

Ghigo, Gianluca, Torsello, D., Ummarino, G. A., Gozzelino, L., Tanatar, M. A., Prozorov, R., and Canfield, P. C.. Disorder-Driven Transition from s± to s++ Superconducting Order Parameter in Proton Irradiated Ba(Fe1-xRhx)2As2 Single Crystals. United States: N. p., Web. doi:10.1103/PhysRevLett.121.107001.
Ghigo, Gianluca, Torsello, D., Ummarino, G. A., Gozzelino, L., Tanatar, M. A., Prozorov, R., & Canfield, P. C.. Disorder-Driven Transition from s± to s++ Superconducting Order Parameter in Proton Irradiated Ba(Fe1-xRhx)2As2 Single Crystals. United States. doi:10.1103/PhysRevLett.121.107001.
Ghigo, Gianluca, Torsello, D., Ummarino, G. A., Gozzelino, L., Tanatar, M. A., Prozorov, R., and Canfield, P. C.. 2018. "Disorder-Driven Transition from s± to s++ Superconducting Order Parameter in Proton Irradiated Ba(Fe1-xRhx)2As2 Single Crystals". United States. doi:10.1103/PhysRevLett.121.107001.
@article{osti_1471223,
title = {Disorder-Driven Transition from s± to s++ Superconducting Order Parameter in Proton Irradiated Ba(Fe1-xRhx)2As2 Single Crystals},
author = {Ghigo, Gianluca and Torsello, D. and Ummarino, G. A. and Gozzelino, L. and Tanatar, M. A. and Prozorov, R. and Canfield, P. C.},
abstractNote = {Here, microwave measurements of the London penetration depth and critical temperature Tc were used to show evidence of a disordered-driven transition from s± to s++ order parameter symmetry in optimally doped Ba(Fe1–xRhx)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 Tc. 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.},
doi = {10.1103/PhysRevLett.121.107001},
journal = {Physical Review Letters},
number = 10,
volume = 121,
place = {United States},
year = {2018},
month = {9}
}