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 |
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Article number | 095009 |
Journal | Superconductor Science and Technology |
Volume | 32 |
Issue number | 9 |
DOIs | |
Publication status | Published - Aug 1 2019 |
Keywords
- Co-doped BaFeAs
- MgB
- focused helium ion beam
- ion-induced damage
- superconductivity
ASJC Scopus subject areas
- Ceramics and Composites
- Condensed Matter Physics
- Metals and Alloys
- Electrical and Electronic Engineering
- Materials Chemistry