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Lützenkirchen-Hecht, Dirk
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Publications (6/6 displayed)
- 2023Role of kinetic energy on Nb3Sn thin films by low-temperature co-sputtering
- 2022Time-Resolved Grazing Incidence X-Ray Absorption Spectroscopy for the In Situ Investigation of the Initial Stages of Sputter-Deposited Copper Thin Filmscitations
- 2017Field Electron Emission From CVD Nanocarbon Films Containing Scrolled Graphene Structurescitations
- 2013Phase transformation during electro-discharge sintering and solution annealing of a metal matrix composite
- 2013Influence of silicon on the formation of intermetallic phases in an AlSi10Fe3 coating deposited on the high strength steel 22MnB5
- 2012Forming of intermetallic phases at the interface of steel–aluminium compounds
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article
Role of kinetic energy on Nb3Sn thin films by low-temperature co-sputtering
Abstract
<jats:p>Nb3Sn is a promising thin film material for superconducting radio frequency (SRF) applications. Although surface resistivity, critical temperature, and critical field are advantageous in comparison to pure Nb, currently the performance of Nb3Sn is lacking behind due to its complex defect structure and phase inhomogeneities. In this work, the influence of the kinetic energy of the deposited particles on the defect structure in Nb3Sn thin films synthesized at low temperatures is investigated. A combination of extended x-ray absorption fine structure analysis, x-ray absorption spectroscopy mapping, and transmission electron microscopy reveals an improved local order and elemental homogeneity of the Nb3Sn films induced by higher kinetic energies of the elemental species during deposition. Even more, these process conditions lead to suppressed local inhomogeneities at grain boundaries, which can be one of the causes of critically reduced superconducting properties of low temperature sputter-coated Nb3Sn thin films. Finally, we show that the magnetic field-induced reduction of critical currents across weak-links formed at grain boundaries can be eliminated by the suggested materials’ synthesis.</jats:p>