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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 16: Poster

AKBP 16.16: Poster

Thursday, March 23, 2023, 15:45–18:30, HSZ OG3

EXAFS study on role of grain boundaries and phase of Nb3Sn thin films — Nils Schäfer¹, Damian Günzing², Nail Karabas¹, Alexey Arzumanov¹, Debora Motta Meira³, Katharina Ollefs², Philipp Komissinskiy¹, Stefan Petzold¹, •Márton Major¹, Dirk Lützenkirchen-Hecht⁴, Heiko Wende², and Lambert Alff¹ — ¹Technical University of Darmstadt, Darmstadt, Germany — ²University of Duisburg-Essen, Duisburg, Germany — ³Argonne National Laboratory, Lemont, IL, USA — ⁴University of Wuppertal, Wuppertal, Germany

In this contribution the low-temperature synthesis of Nb₃Sn, a promising material for superconducting radio frequency (SRF) application is presented. Theoretically Nb₃Sn is superior to Nb in surface resistivity, critical temperature and critical field, but in practice the performance is lacking behind due to early quenching at low fields. Co-sputtering at low sample temperature could overcome the microstructure-related limitations due to the high kinetic energy of the sputtered particles. Extended x-ray absorption fine structure analysis and x-ray absorption spectroscopy mapping were utilized to show the improved local order and elemental homogeneity of the Nb₃Sn films. Additionally, the presence of a grain-boundary network acting as Josephson-like junctions was found. Excellent elemental homogeneity and a good grain boundary state promoted by kinetic energy was demonstrated.

Work supported by BMBF through grant Nos. 05H21RDRB1, 05H21PXRB1 and DFG via the AccelencE Research Training Group (GRK 2128).