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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

Journal Article · · Physical Review Letters
 [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)

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.

Research Organization:
Ames Lab., Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1471223
Alternate ID(s):
OSTI ID: 1468839
Report Number(s):
IS-J-9753; PRLTAO
Journal Information:
Physical Review Letters, Vol. 121, Issue 10; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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Cited By (3)

Eliashberg Analysis of the Electrodynamic Response of Ba(Fe1−xRhx)2As2 Across the s± to s++ Order Parameter Transition journal December 2019
Electrodynamic response of Ba(Fe1−xRhx)2As2 across the s± to s++ order parameter transition journal July 2019
Electrodynamic response of Ba(Fe1-xRhx)2As2 across the s+- to s++ order parameter transition text January 2019

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