Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 34: Superconductivity: Tunneling and Josephson Junctions
TT 34.5: Vortrag
Dienstag, 13. März 2018, 10:45–11:00, H 2053
Evidence of Shapiro steps in hysteretic nanobridge weak link Josephson junctions — •Connor Shelly, Patrick See, Jane Ireland, and Jonathan Williams — National Physical Laboratory, Hampton Rd, Teddington, TW11 0LW, United Kingdom
We present experimental work demonstrating the response of superconducting nanobridge Josephson junctions to microwave irradiation. Our nanobridge devices exhibit hysteretic current-voltage characteristics (IVC) below 7 K. In this regime the devices enter a resistive state when the applied current is increased to a value greater than the junction critical current Ic. When the applied current is then reduced, the nanobridge remains in the resistive state until the re-trapping current Ir is reached, where Ir < Ic. Unlike traditional tunnel junctions it is widely considered that the origin of this hysteresis is thermal with the device remaining in a non-superconducting state such that T > Tc on the re-trapping branch of the IVC [1-3]. However we present evidence of Shapiro steps in the hysteretic branch of the IVC.
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