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

Research output: Contribution to journal › Article

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

Fingerprint

Helium
helium ions
Ion beams
Focused ion beams
ion beams
Irradiation
Superconductivity
Thin films
dosage
Dosimetry
irradiation
superconductivity
thin films
Ions
Group 5A compounds
Substrates
swelling
Josephson junctions
Spatial distribution
Swelling

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

Normal-state and superconducting properties of Co-doped BaFe2As2 and MgB2 thin films after focused helium ion beam irradiation. / Kasaei, L.; Manichev, V.; Li, M.; Feldman, Leonard C; Gustafsson, T.; Collantes, Y.; Hellstrom, E.; Demir, M.; Acharya, N.; Bhattarai, P.; Chen, Ke; Xi, X. X.; Davidson, B. A.

In: Superconductor Science and Technology, Vol. 32, No. 9, 095009, 01.08.2019.

Research output: Contribution to journal › Article

Kasaei, L, Manichev, V, Li, M, Feldman, LC, Gustafsson, T, Collantes, Y, Hellstrom, E, Demir, M, Acharya, N, Bhattarai, P, Chen, K, Xi, XX & Davidson, BA 2019, 'Normal-state and superconducting properties of Co-doped BaFe2As2 and MgB2 thin films after focused helium ion beam irradiation', Superconductor Science and Technology, vol. 32, no. 9, 095009. https://doi.org/10.1088/1361-6668/ab2d52
Kasaei L, Manichev V, Li M, Feldman LC, Gustafsson T, Collantes Y et al. Normal-state and superconducting properties of Co-doped BaFe2As2 and MgB2 thin films after focused helium ion beam irradiation. Superconductor Science and Technology. 2019 Aug 1;32(9). 095009. https://doi.org/10.1088/1361-6668/ab2d52
Kasaei, L. ; Manichev, V. ; Li, M. ; Feldman, Leonard C ; Gustafsson, T. ; Collantes, Y. ; Hellstrom, E. ; Demir, M. ; Acharya, N. ; Bhattarai, P. ; Chen, Ke ; Xi, X. X. ; Davidson, B. A. / Normal-state and superconducting properties of Co-doped BaFe2As2 and MgB2 thin films after focused helium ion beam irradiation. In: Superconductor Science and Technology. 2019 ; Vol. 32, No. 9.
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AU - Feldman, Leonard C

AU - Gustafsson, T.

AU - Collantes, Y.

AU - Hellstrom, E.

AU - Demir, M.

AU - Acharya, N.

AU - Bhattarai, P.

AU - Chen, Ke

AU - Xi, X. X.

AU - Davidson, B. A.

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N2 - 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.

AB - 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.

KW - Co-doped BaFeAs

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