Low-Energy Response of Superconducting Tunnel Junction X-ray Spectrometers

Simon E. Labov, L. H. Hiller, C. A. Mears, Matthias Frank, H. Netel, F. Azgui, A. T. Barfknecht

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Thin film structures incorporating metallic superconducting layers and tunnel junctions can be configured as low-energy X-ray spectrometers. We present results obtained when low-energy X-rays are absorbed in niobium films coupled to aluminum layers that serve as quasiparticle traps in an Nb/Al/Al2O3/Al/Nb tunnel junction X-ray detector. The linearity of the pulse height as a function of energy is discussed along with the energy dependence of the observed resolution and its relation to the broadening mechanisms. A resolution of 14 eV at 1 keV has been measured with our detector cooled to 03 K.

Original languageEnglish (US)
Pages (from-to)3034-3037
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2
StatePublished - Jan 1 1995
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)


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