Spectroscopic evidence of odd frequency superconducting order
Avradeep Pal, Jabir Ali Ouassou, Matthias Eschrig, Jacob Linder, and, Mark Blamire
TL;DR
This paper presents spectroscopic evidence indicating the presence of odd frequency superconducting order in spin filter superconducting tunnel junctions, highlighting a conductance peak as a signature of unconventional superconductivity.
Contribution
It provides experimental spectroscopic evidence for odd frequency superconductivity in NbN/GdN/TiN junctions, a novel observation in this context.
Findings
Zero bias conductance peak observed at low temperatures
Peak magnitude exceeds normal state conductance
Signature of unconventional, odd frequency superconductivity
Abstract
Spin filter superconducting S/I/N tunnel junctions (NbN/GdN/TiN) show a robust and pronounced zero bias conductance peak 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.
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Taxonomy
TopicsPhysics of Superconductivity and Magnetism · Rare-earth and actinide compounds · Quantum and electron transport phenomena