Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

9-1-2017

Journal or Book Title

Physical Review B

Volume

96

Issue

9

First Page

094523

DOI

10.1103/PhysRevB.96.094523

Abstract

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(Fe1−xRhx)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.

Comments

This article is published as Moroni, M., L. Gozzelino, G. Ghigo, M. A. Tanatar, R. Prozorov, P. C. Canfield, and P. Carretta. "Effect of proton irradiation on the normal-state low-energy excitations of Ba (Fe 1− x Rh x) 2 As 2 superconductors." Physical Review B 96, no. 9 (2017): 094523. DOI: 10.1103/PhysRevB.96.094523. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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