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Non-equilibrium experiments in LTS Josephson double tunnel devices [Nb/Al/AlO/sub x//Nb]

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9 Author(s)
Ammendola, G. ; Dipt. di Sci. Fisiche, Naples Univ., Italy ; Pepe, G.P. ; Peluso, G.P. ; Peluso, G.
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Superconducting Tunnel Junctions (STJ) are promising devices as a next generation of nuclear and optical detectors. Non-equilibrium experiments can provide useful information on the behaviour of a perturbed superconductor. Among possible nonequilibrium sources, we used quasi-particle injection in three-terminal double tunnel junction devices and a laser pumping source. We investigated the effect of perturbed conditions on sub-harmonic gap structures, which are present in I-V characteristics of high quality Nb-based STJs. Experimental results concerning the change of the energy gap measured at V=2/spl Delta//2e show features which can not be completely explained in terms of simple heating effects.

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Applied Superconductivity, IEEE Transactions on  (Volume:9 ,  Issue: 2 )