Physics – Condensed Matter – Superconductivity
Scientific paper
2002-09-02
Physics
Condensed Matter
Superconductivity
To appear in Phys Rev B, October 1 Issue
Scientific paper
10.1103/PhysRevB.66.144512
We have investigated the I-V characteristics of strongly disordered ultra-thin films of {\it Bi} and {\it Sn} produced by quench-condensation. Our results show that both these sytems can be visualized as strongly disordered arrays of Josephson junctions. The experimentally observed I-V characteristics of these films is hysteretic, when the injected current is ramped from zero to critical current and back. These are remarkably similar to the hysteretic I-V of an underdamped single junction. We show by computer simulations that hysteresis can persist in a very strongly disordered array. It is also possible to estimate the individual junction parameters ($R$, $C$ and $I_c$) from the experimental I-Vs of the film using this model. The films studied are in a regime where the Josephson-coupling energy is larger than the charging energy. We find that a simple relation $I_c(T)=I_c(0)(1-(T/T_c)^4)$ describes the temperature dependence of the critical current quite accurately for films with sheet resistance $\sim$ 500$\Omega$ or lower. We also find evidence of a vortex-unbindi
Chandrasekhar N.
Gupta Das K.
Sambandamurthy G.
Soman Swati S.
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