title: Spectroscopic evidence of odd frequency superconducting order.
abstract: Spin filter superconducting S/I/N tunnel junctions (NbN/GdN/TiN) show a robust and pronounced Zero Bias Conductance Peak (ZBCP) at low temperatures, the magnitude of which is several times the normal state conductance of the junction. Such a conductance anomaly is representative of unconventional superconductivity and is interpreted as a direct signature of an odd frequency superconducting order.
authors.affiliation: Department of Materials Science, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom.
authors.forename: Avradeep
authors.initials: A
authors.lastname: Pal
authors.affiliation: Department of Physics, NTNU, Norwegian University, N-7491 Trondheim, Norway.
authors.forename: J A
authors.initials: JA
authors.lastname: Ouassou
authors.affiliation: SEPnet and Hubbard Theory Consortium, Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Eschrig
authors.affiliation: Department of Physics, NTNU, Norwegian University, N-7491 Trondheim, Norway.
authors.forename: J
authors.initials: J
authors.lastname: Linder
authors.affiliation: Department of Materials Science, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom.
authors.forename: M G
authors.initials: MG
authors.lastname: Blamire