Normal-state and superconducting properties of Co-doped BaFe2As2 and MgB2 thin films after focused helium ion beam irradiation

L. Kasaei, V. Manichev, M. Li, Leonard C Feldman, T. Gustafsson, Y. Collantes, E. Hellstrom, M. Demir, N. Acharya, P. Bhattarai, Ke Chen, X. X. Xi, B. A. Davidson

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Abstract

We have investigated the normal-state and superconducting properties of Co-doped BaFe2As2 (Ba122) and MgB2 thin films irradiated at room temperature using a 30 keV focused He+ ion beam with doses between 1012and 1017 cm2. We show that superconductivity is suppressed and the normal-state resistivity is increased upon irradiation. The critical dose for the complete suppression of superconductivity is ∼5 -1014 cm-2 for Ba122 and ∼8 -1015 cm-2 for MgB2. The dependence of the normal-state and superconducting properties on irradiation dose is discussed, taking into account the spatial distribution of ion-induced damage. Hillock formation due to the substrate swelling, arising from the He+ ions stopped in the substrate, is also observed. The findings provide guidelines for exploiting focused He+ ion beam irradiation in fabricating iron pnictide and MgB2 planar Josephson junctions.

Original languageEnglish
Article number095009
JournalSuperconductor Science and Technology
Volume32
Issue number9
DOIs
Publication statusPublished - Aug 1 2019

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Keywords

  • Co-doped BaFeAs
  • focused helium ion beam
  • ion-induced damage
  • MgB
  • superconductivity

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this

Kasaei, L., Manichev, V., Li, M., Feldman, L. C., Gustafsson, T., Collantes, Y., Hellstrom, E., Demir, M., Acharya, N., Bhattarai, P., Chen, K., Xi, X. X., & Davidson, B. A. (2019). Normal-state and superconducting properties of Co-doped BaFe2As2 and MgB2 thin films after focused helium ion beam irradiation. Superconductor Science and Technology, 32(9), [095009]. https://doi.org/10.1088/1361-6668/ab2d52