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Title: Effects of proton irradiation on flux-pinning properties of underdoped Ba(Fe 0.96Co 0.04) 2As 2 pnictide superconductor

Abstract

We study the effect of proton irradiation on Ba(Fe 0.96Co 0.04) 2As 2 superconducting single crystals from combined magnetisation and magnetoresistivity measurements. The study allows the extraction of the values of the apparent pinning energy U 0 of the samples prior to and after irradiation, as well as comparison of the values of U 0 obtained from the flux-flow reversible region with those from the flux-creep irreversible region. Irradiation reduces T c modestly, but significantly reduces U 0 in both regimes: the critical current density J c is modified, most strikingly by the disappearance of the second magnetisation peak after irradiation. Analysis of the functional form of the pinning force and of the temperature dependence of J c for zero field, indicates that proton irradiation in this case has not changed the pinning regime, but has introduced a high density of shallow point-like defects. Lastly, by considering a model that takes into account the effect of disorder on the irreversibility line, the data suggests that irradiation produced a considerable reduction in the average effective disorder overall, consistent with the changes observed in U 0 and J c.

Authors:
 [1];  [2];  [1];  [3];  [4];  [2]; ORCiD logo [1]
  1. Univ. Federal do Rio de Janeiro, Rio de Janeiro (Brazil)
  2. Imperial College, London (United Kingdom)
  3. Instituto Nacional de Metrologia Qualidade e Tecnologia, Duque de Caxias (Brazil)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1339408
Alternate Identifier(s):
OSTI ID: 1397591
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Alloys and Compounds
Additional Journal Information:
Journal Volume: 694; Journal Issue: C; Journal ID: ISSN 0925-8388
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; pnictides; proton irradiation; superconducting critical current; flux-pinning

Citation Formats

Salem-Sugui, S., Moseley, D., Stuard, S. J., Alvarenga, A. D., Sefat, A. S., Cohen, L. F., and Ghivelder, L. Effects of proton irradiation on flux-pinning properties of underdoped Ba(Fe0.96Co0.04)2As2 pnictide superconductor. United States: N. p., 2016. Web. doi:10.1016/j.jallcom.2016.10.103.
Salem-Sugui, S., Moseley, D., Stuard, S. J., Alvarenga, A. D., Sefat, A. S., Cohen, L. F., & Ghivelder, L. Effects of proton irradiation on flux-pinning properties of underdoped Ba(Fe0.96Co0.04)2As2 pnictide superconductor. United States. doi:10.1016/j.jallcom.2016.10.103.
Salem-Sugui, S., Moseley, D., Stuard, S. J., Alvarenga, A. D., Sefat, A. S., Cohen, L. F., and Ghivelder, L. Thu . "Effects of proton irradiation on flux-pinning properties of underdoped Ba(Fe0.96Co0.04)2As2 pnictide superconductor". United States. doi:10.1016/j.jallcom.2016.10.103. https://www.osti.gov/servlets/purl/1339408.
@article{osti_1339408,
title = {Effects of proton irradiation on flux-pinning properties of underdoped Ba(Fe0.96Co0.04)2As2 pnictide superconductor},
author = {Salem-Sugui, S. and Moseley, D. and Stuard, S. J. and Alvarenga, A. D. and Sefat, A. S. and Cohen, L. F. and Ghivelder, L.},
abstractNote = {We study the effect of proton irradiation on Ba(Fe0.96Co0.04)2As2 superconducting single crystals from combined magnetisation and magnetoresistivity measurements. The study allows the extraction of the values of the apparent pinning energy U0 of the samples prior to and after irradiation, as well as comparison of the values of U0 obtained from the flux-flow reversible region with those from the flux-creep irreversible region. Irradiation reduces Tc modestly, but significantly reduces U0 in both regimes: the critical current density Jc is modified, most strikingly by the disappearance of the second magnetisation peak after irradiation. Analysis of the functional form of the pinning force and of the temperature dependence of Jc for zero field, indicates that proton irradiation in this case has not changed the pinning regime, but has introduced a high density of shallow point-like defects. Lastly, by considering a model that takes into account the effect of disorder on the irreversibility line, the data suggests that irradiation produced a considerable reduction in the average effective disorder overall, consistent with the changes observed in U0 and Jc.},
doi = {10.1016/j.jallcom.2016.10.103},
journal = {Journal of Alloys and Compounds},
issn = {0925-8388},
number = C,
volume = 694,
place = {United States},
year = {2016},
month = {10}
}

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