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-AlO(x)/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 (55)Fe source.
Nb/Al STJ detectors with sub-nA subgap current
Sabino Maggi;
2006
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-AlO(x)/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 (55)Fe source.File in questo prodotto:
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