Abstract
Superconducting Nb/AlAlOx/Nb tunnel junctions (STJs) with epitaxial niobium base electrode are investigated as weak x-ray detectors. The recorded x-ray spectra show a two peak structure that is attributed to the absorption of 6 keV x-rays in the two junction electrodes. Low Temperature Scanning Electron Microscopy (LTSEM) proves, that the high charge output peak of the x-ray spectra is associated with x-rays absorbed in the epitaxial niobium film. The significantly reduced charge output for events in the polycrystalline niobium electrode is found to be bias voltage dependent.
Original language | English |
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Pages (from-to) | 1663-1664 |
Number of pages | 2 |
Journal | Physica B: Condensed Matter |
Volume | 194-196 |
Issue number | PART 2 |
DOIs | |
State | Published - 2 Feb 1994 |
Externally published | Yes |