Low temperature characterization of high efficiency spin-filter Josephson junctions Roberta Caruso, Halima Giovanna Ahmad, Avradeep Pal, Giovanni Piero Pepe, Davide Massarotti, Mark G. Blamire and Francesco Tafuri EPJ Web Conf., 233 (2020) 05007 Published online: 16 April 2020 DOI: 10.1051/epjconf/202023305007