Superconducting tunnel junctions (STJ) are promising high-resolution radiation detectors because of their larger energy resolution with respect to conventional Si-based detectors. We have developed a fabrication process for Nb/Al-AlOx/Nb STJ devices which produces junctions with subgap currents below 50 pA at 300 mK, a factor of 10-6 less than the subgap current at 4.2 K. We report the details of the fabrication process and preliminary results on X-ray measurements at 300 mK with a 5 mC 55Fe source. © 2006 Elsevier B.V. All rights reserved.

Nb/Al STJ detectors with sub-nA subgap current

AGOSTINO, Angelo;
2006-01-01

Abstract

Superconducting tunnel junctions (STJ) are promising high-resolution radiation detectors because of their larger energy resolution with respect to conventional Si-based detectors. We have developed a fabrication process for Nb/Al-AlOx/Nb STJ devices which produces junctions with subgap currents below 50 pA at 300 mK, a factor of 10-6 less than the subgap current at 4.2 K. We report the details of the fabrication process and preliminary results on X-ray measurements at 300 mK with a 5 mC 55Fe source. © 2006 Elsevier B.V. All rights reserved.
2006
435
103
106
http://www.scopus.com/inward/record.url?eid=2-s2.0-33645019072&partnerID=40&md5=e2bc870b9598b9fed8477f5a4f39e273
Aluminum compounds, Electric currents, Radiation detectors, Silicon compounds; Josephson junctions, STJ junctions, Subgap currents; Josephson junction devices
S. Maggi;N. D. Leo;V. Lacquaniti;A. Agostino;R. Gonnelli;P. Verhoeve
File in questo prodotto:
File Dimensione Formato  
ISI - 2006_PHYSICA C_NbAl STJ detectors with sub-nA subgap current.pdf

Accesso riservato

Tipo di file: POSTPRINT (VERSIONE FINALE DELL’AUTORE)
Dimensione 145.92 kB
Formato Adobe PDF
145.92 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

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: https://hdl.handle.net/2318/129974
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? 0
social impact