We report the experimental method of the evaluation of the specific boundary resistance, RB, of superconductor (S)/non-superconductor (NS) interfaces by measuring the superconducting critical temperature, Tc, as a function of the thickness of the superconducting layer, dS, in S/NS hybrids and of the number of S/NS bilayers, Nbl, for a large number of Nbl in NS/[S/NS]Nbl multilayers. Two types of systems have been studied. We choose Nb as the S material for both types and Cu for a normal metal (N) for the first one. In the second case, a weakly ferromagnetic alloy (F), Cu0.38Ni0.62, was chosen for NS. Analyzing the experimental results by solving exactly the Usadel equations, we were able to unambiguously determine the value of RB for both the S/N and S/F hybrids. The results show that Nb/Cu is characterized by a lower value of the interfacial specific resistance with respect to the case of Nb/Cu0.38Ni0.62.

Interface Properties of Superconductor-Based Heterostructures from Critical Temperature Measurements

MANCUSI, DAVIDE;CIRILLO, CARLA;ATTANASIO, Carmine
2013

Abstract

We report the experimental method of the evaluation of the specific boundary resistance, RB, of superconductor (S)/non-superconductor (NS) interfaces by measuring the superconducting critical temperature, Tc, as a function of the thickness of the superconducting layer, dS, in S/NS hybrids and of the number of S/NS bilayers, Nbl, for a large number of Nbl in NS/[S/NS]Nbl multilayers. Two types of systems have been studied. We choose Nb as the S material for both types and Cu for a normal metal (N) for the first one. In the second case, a weakly ferromagnetic alloy (F), Cu0.38Ni0.62, was chosen for NS. Analyzing the experimental results by solving exactly the Usadel equations, we were able to unambiguously determine the value of RB for both the S/N and S/F hybrids. The results show that Nb/Cu is characterized by a lower value of the interfacial specific resistance with respect to the case of Nb/Cu0.38Ni0.62.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/4025252
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 4
  • ???jsp.display-item.citation.isi??? 4
social impact