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

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

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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

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.

AU - Davidson, B. A.

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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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10.1088/1361-6668/ab2d52