Effect of proton irradiation on the normal-state low-energy excitations of Ba(Fe1xRhx)2As2 superconductors

M. Moroni, L. Gozzelino, G. Ghigo, M. A. Tanatar, R. Prozorov, P. C. Canfield, and P. Carretta
Phys. Rev. B 96, 094523 – Published 19 September 2017

Abstract

We present a As75 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(Fe1xRhx)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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  • Received 17 May 2017
  • Revised 30 August 2017

DOI:https://doi.org/10.1103/PhysRevB.96.094523

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

M. Moroni1,*, L. Gozzelino2,3, G. Ghigo2,3, M. A. Tanatar4, R. Prozorov4, P. C. Canfield4, and P. Carretta1

  • 1Department of Physics, University of Pavia-CNISM, I-27100 Pavia, Italy
  • 2Istituto Nazionale di Fisica Nucleare, Sez. Torino, Torino 10125, Italy
  • 3Politecnico di Torino, Dept. of Applied Science and Technology, 10129 Torino, Italy
  • 4Ames Laboratory USDOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

  • *matteo.moroni01@universitadipavia.it

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Issue

Vol. 96, Iss. 9 — 1 September 2017

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