Title :
Negative-resistance voltage-current characteristics of superconductor contact junctions for macro-scale applications
Author :
Takayasu, Makoto ; Matsui, Toshiaki ; Minervini, Joseph V.
Author_Institution :
Plasma Sci. & Fusion Center, Massachusetts Inst. of Technol., Cambridge, MA, USA
fDate :
6/1/2003 12:00:00 AM
Abstract :
Voltage-current characteristics of mechanical pressure contact junctions between superconducting wires are investigated using a voltage-driving method. It is found that the switching regions at low voltages result from negative resistance of the contact junction. The current transport of the contact junctions is discussed from the perspective of two existing models: the multiple Andreev reflections at the two SN interfaces of a SNS (Superconductor/Normal metal/Superconductor) junction and the inhomogeneous multiple Josephson weak-link array.
Keywords :
Josephson effect; contact resistance; multifilamentary superconductors; negative resistance; superconductor-normal-superconductor devices; Nb-clad wires; NbT-Nb; NbTi multifilamentary superconductors; SN interfaces; SNS junction; current transport; inhomogeneous multiple Josephson weak-link array; macro-scale applications; mechanical pressure contact junctions; multiple Andreev reflections; negative-resistance V-I characteristics; superconducting wires; superconductor contact junctions; superconductor/normal metal/superconductor junction; switching regions; voltage-current characteristics; voltage-driving method; Conductors; Contacts; Josephson junctions; Multifilamentary superconductors; Niobium compounds; Superconducting devices; Superconducting filaments and wires; Switches; Titanium compounds; Voltage;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2003.812854
