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

doi:10.1088/1361-6668/ab2d52

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

Rutgers University

Research output: Contribution to journal › Article

1 Citation (Scopus)

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 language	English
Article number	095009
Journal	Superconductor Science and Technology
Volume	32
Issue number	9
DOIs	https://doi.org/10.1088/1361-6668/ab2d52
Publication status	Published - Aug 1 2019

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

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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

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, 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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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.",

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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.

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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.

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