We study the stochastic nature of switching current in hysteretic current-voltage characteristics of superconductor-graphene-superconductor junctions. We find that the dispersion of the switching current distribution scales with temperature as σ ITα G with α G as low as 1/3. This observation is in sharp contrast to the known Josephson junction behavior where σ ITα J with α J=2/3. We propose an explanation using a generalized version of Kurkijärvi's theory for the flux stability in rf-SQUID and attribute this anomalous effect to the temperature dependence of the critical current which persists down to low temperatures.
ASJC Scopus subject areas
- Physics and Astronomy(all)