Response of niobium-based superconducting tunnel junctions in the soft-x-ray region 0.15{endash}6.5 keV
- Astrophysics Division, Space Science Department of the European Space Agency, Estec, P.O. Box 299, 2200 AG Noordwijk (The Netherlands)
- Oxford Instruments Scientific Research Division, Newton House, Cambridge Business Park, Cowley Road, Cambridge CB44WZ (England)
- Physikalisch-Technische Bundesanstalt, Abbestrasse 2-12, D-10587 Berlin (Germany)
- Cambridge Microfab Ltd, Trollheim Cranes Lane, Kingston, Cambridge CB37NJ (England)
The response of niobium-based superconducting tunnel junctions to irradiation with monochromatic soft x rays in the energy range of 0.15{endash}6.5 keV has been measured, using monochromatized synchrotron radiation and a {sup 55}Fe radioactive source. Nonlinearities in this response have been observed which depend on the size of the device and the thickness of the electrode in which the photon absorption takes place. The nonlinearities can be explained in terms of self-recombination of quasiparticles by means of a model based on the Rothwarf-Taylor equations. No variations in the mean energy required to produce one quasiparticle have been observed near the {ital M} and {ital L} edges of niobium. The linear dependence of the energy resolution on photon energy indicates that the resolution is dominated by spatial variations in the response of the devices. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 434885
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 53, Issue 2; Other Information: PBD: Jan 1996
- Country of Publication:
- United States
- Language:
- English
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