Effect of proton irradiation on the normal-state low-energy excitations of Ba(Fe1-xRhx)2As2 superconductors

Moroni, M.; Gozzelino, L.; Ghigo, G.; Tanatar, M. A.; Prozorov, R.; Canfield, P. C.; Carretta, P.

doi:10.1103/PhysRevB.96.094523

Title: Effect of proton irradiation on the normal-state low-energy excitations of Ba(Fe_1-xRh_x)₂As₂ superconductors

Journal Article · Tue Sep 19 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.094523· OSTI ID:1396277

Moroni, M. ^[1]; Gozzelino, L. ^[2]; Ghigo, G. ^[2]; Tanatar, M. A. ^[3]; Prozorov, R. ^[3]; Canfield, P. C. ^[3]; Carretta, P. ^[1]

Univ. of Pavia-CNISM, Pavia (Italy)
Istituto Nazionale di Fisica Nucleare, Torino (Italy); Politecnico di Torino, Torino (Italy)
Iowa State Univ., Ames, IA (United States)

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)₂As₂ 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/T₂ 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.

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Research Organization:: Ames Lab., Ames, IA (United States)

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

Grant/Contract Number:: 2015C5SEJJ; 2012X3YFZ2; AC02-07CH11358

OSTI ID:: 1396277

Alternate ID(s):: OSTI ID: 1392722

Report Number(s):: IS-J-9458; PRBMDO; TRN: US1702846

Journal Information:: Physical Review B, Vol. 96, Issue 9; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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Title: Effect of proton irradiation on the normal-state low-energy excitations of Ba(Fe_1-xRh_x)₂As₂ superconductors