Experimental investigations on the proximity effect in Nb/Al bilayers by using Nb/AlOy/Nb/Al/AlxOy/Nb structures with different Al thickness are reported. Three-terminal stacked devices were fabricated by using a new process based on a whole-wafer deposition of the multilayer without any vacuum breaking in order to ensure a high control of the interfaces. The quasiparticle density of states at both sides of the bilayer and the effective interface coupling parameters were obtained by a deconvolution of the I-V data. They were compared with numerical calculations based on the microscopic model proposed by Golubov et al. [Phys. Rev. B 51 (1995) 1073] for the proximity effect in spatially inhomogeneous bilayers. The investigation has been also performed in the presence of steady-state injection at different quasiparticle energies. (C) 2002 Elsevier Science B.V. All rights reserved.
Double stacked superconducting junctions for investigating the proximity effect in Nb/Al bilayers / Parlato, Loredana; Pepe, GIOVANNI PIERO; Peluso, Giuseppe; R., Scaldaferri; C., Granata; E., Esposito; M., Russo; N., Booth; A., Barone. - In: PHYSICA. C, SUPERCONDUCTIVITY. - ISSN 0921-4534. - STAMPA. - 372:(2002), pp. 351-354. [10.1016/S0921-4534(02)00667-6]
Double stacked superconducting junctions for investigating the proximity effect in Nb/Al bilayers
PARLATO, LOREDANA;PEPE, GIOVANNI PIERO;PELUSO, GIUSEPPE;
2002
Abstract
Experimental investigations on the proximity effect in Nb/Al bilayers by using Nb/AlOy/Nb/Al/AlxOy/Nb structures with different Al thickness are reported. Three-terminal stacked devices were fabricated by using a new process based on a whole-wafer deposition of the multilayer without any vacuum breaking in order to ensure a high control of the interfaces. The quasiparticle density of states at both sides of the bilayer and the effective interface coupling parameters were obtained by a deconvolution of the I-V data. They were compared with numerical calculations based on the microscopic model proposed by Golubov et al. [Phys. Rev. B 51 (1995) 1073] for the proximity effect in spatially inhomogeneous bilayers. The investigation has been also performed in the presence of steady-state injection at different quasiparticle energies. (C) 2002 Elsevier Science B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
