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

Volume

13

Issue

2

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

1648

Lastpage

1651

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;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2003.812854

Filename

1211920