J. Phys. IV France 08 (1998) Pr3-255-Pr3-258
Non-equilibrium properties of Josephson critical current in Nb-based three terminal superconducting tunnel devicesG. Ammendola1, L. Parlato1, G. Peluso1, G. Pepe1, E. Esposito2 and R. Monaco2
1 Università di Napoli Federico II, Dipartimento Scienze Fisiche, Facoltà di Ingegneria, P.le Tecchio 80, 80125 Naples, ltaly
2 Istituto di Cibernetica del CNR, Arco Felice, Naples, ltaly
Tunnel quasi-particle injection into a superconducting film provides useful information on the non-equilibrium state inside the perturbed superconductor as well as on the potential application to electronic devices. Three terminal injector-detector superconducting devices have a long history in non-equilibrium superconductivity. In the recent past non-equilibrium phenomena have attracted again considerable attention because of many superconducting based detectors involve processes substantially non-equilibrium in nature. The possibility of using a stacked double tunnel junction to study the influence of non-equilibrium superconductivity on the Josephson critical current is now considered. An experimental study of the effect of quasi-particle injection on the Josephson current both in steady-state and pulsed experiments down to T=1.2K is presented using 3 terminal Nb-based stacked double tunnel devices. The feasibility of a new class of particle detectors based on the direct measurement of the change in the Josephson current following the absorption of a X-ray quantum is also discussed in terms of non-equilibrium theories.
© EDP Sciences 1998