Controlling hysteresis in superconducting constrictions with a resistive shunt. (18th May 2015)

• Record Type: Journal Article
• Authors: Kumar, Nikhil; Winkelmann, C B; Biswas, Sourav; Courtois, H; Gupta, Anjan K
• Is Part Of: Superconductor science & technology. Volume 28:Number 7(2015:Jul.)
• Publication Date: 2015-05-18
• Subjects: superconducting constrictions -- micro-SQUIDs -- hysteresis; 74.78.-w -- 73.63.-b -- 74.45.+c -- 85.25.Dq; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/0953-2048/28/7/072003
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: We demonstrate control of the thermal hysteresis in superconducting constrictions by adding a resistive shunt. In order to prevent thermal relaxation oscillations, the shunt resistor is placed in close proximity to the constriction, making the inductive current-switching time smaller than the thermal equilibration time. We investigate the current–voltage characteristics of the same constriction with and without the shunt-resistor. The widening of the hysteresis-free temperature range is explained on the basis of a simple model.