Multiple routes for vortex depinning in amorphous thin film superconductors

Technical Report · Mon Jul 01 04:00:00 EDT 1996

DOI:https://doi.org/10.2172/261101· OSTI ID:261101

Groenbech-Jensen, N; Bishop, A R; Dominquez, D

ffWe present simulations of vortex dynamics in amorphous two-dimensional thin film superconductors, using a new exact method to evaluate long range interactions between vortices. We find that the onset of vortex motion is dominated by filamentary channels of flow. There are multiple patterns of filamentary flow which are stable in a wide range of bias current. As a consequence, there are multiple steps in the differential resistance, each step corresponding to a different pattern of filamentary flow. This results in a strong history dependence of the depinning current and current voltage characteristics. Our results are in agreement with recent experiments on amorphous Mo{sub 77}Ge{sub 23} thin films.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 261101
• Report Number(s): LA-UR--96-1575; CONF-960849--2; ON: TI96011228
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
AMORPHOUS STATE
ANALYTICAL SOLUTION
GERMANIUM ALLOYS
MAGNETIC FLUX
MATHEMATICAL MODELS
MOLYBDENUM BASE ALLOYS
SUPERCONDUCTING FILMS
TYPE-II SUPERCONDUCTORS
VORTICES