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This content will become publicly available on September 19, 2018

Title: Effect of proton irradiation on the normal-state low-energy excitations of Ba(Fe 1-xRh x) 2As 2 superconductors

Here, we present a 75As nuclear magnetic resonance (NMR) and resistivity study of the effect of 5.5 MeV proton irradiation on the optimal electron doped (x = 0.068) and overdoped (x = 0.107) Ba(Fe 1–xRh x) 2As 2 iron based superconductors. While the proton induced defects only mildly suppress the critical temperature and increase residual resistivity in both compositions, sizable broadening of the NMR spectra was observed in all the irradiated samples at low temperature. The effect is significantly stronger in the optimally doped sample where the Curie Weiss temperature dependence of the line width suggests the onset of ferromagnetic correlations coexisting with superconductivity at the nanoscale. 1/T 2 measurements revealed that the energy barrier characterizing the low energy spin fluctuations of these compounds is enhanced upon proton irradiation, suggesting that the defects are likely slowing down the fluctuations between (0,π) and (π,0) nematic ground states.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [3] ;  [3] ;  [1]
  1. Univ. of Pavia-CNISM, Pavia (Italy)
  2. Istituto Nazionale di Fisica Nucleare, Torino (Italy); Politecnico di Torino, Torino (Italy)
  3. Iowa State Univ., Ames, IA (United States)
Publication Date:
Report Number(s):
IS-J-9458
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1702846
Grant/Contract Number:
2015C5SEJJ; 2012X3YFZ2; AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 9; Journal ID: ISSN 2469-9950
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:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1396277
Alternate Identifier(s):
OSTI ID: 1392722