Resistance fluctuations in insulating silicon films with superconducting nanopreciptitates – superconductor-to-metal or vortex matter phase transition?
Resistance fluctuations in insulating silicon films with superconducting nanopreciptitates – superconductor-to-metal or vortex matter phase transition?
Heera, V.; Fiedler, J.; Skorupa, J.; Skorupa, W.
Silicon films with Ga-rich nanoprecipitates are superconductors or insulators in dependence on their normal state resistance. Even in the insulating state of the film superconducting nanoprecipitates exist below the critical temperature of 7 K and determine its complex transport behavior. In this range sometimes large, random resistance jumps appear that are accompanied by little temperature changes. The resistance fluctuates between a well-defined low-resistance value and a broader band of higher resistances. Jumps to higher resistance are associated with a temperature decrease and vice versa. We present experimental results on these fluctuations and suppose a first order phase transition in the film as probable origin.
Keywords: resistance fluctuations; silicon film; superconducting nanoprecipitates; first order phase transition; vortex matter
Involved research facilities
- Ion Beam Center DOI: 10.17815/jlsrf-3-159
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