Influence of filament spirality on current-voltage characteristics of twisted multifilamentary NbTi superconductors

✍ Scribed by M. Polák; R.G. Mints; M. Majoroš

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 583 KB
• Volume: 29
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(89)90241-5

✦ Synopsis

It is shown experimentally, that the current-voltage characteristics of a twisted NbTi multifilamentary superconductor placed in a perpendicular magnetic field differ from those of untwisted superconductors. It was explained by the current transfer across the normal metal matrix due to the inhomogeneous electric field distribution along each filament. Electric field inhomngeneities along each filament arise as a result of varying the angle between the external magnetic field and filament axis. Several model conductors were prepared to investigate the role of the normal metal matrix resistivity and the geometrical arrangement of filaments. A two-dimensional theoretical model explaining the measured characteristics is also presented.