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Publication Detail
Proximity effects and nonequilibrium superconductivity in transition-edge sensors
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Sadleir JE, Smith SJ, Robinson IK, Finkbeiner FM, Chervenak JA, Bandler SR, Eckart ME, Kilbourne CA
  • Publisher:
    AMER PHYSICAL SOC
  • Publication date:
    03/11/2011
  • Journal:
    PHYS REV B
  • Volume:
    84
  • Issue:
    18
  • Print ISSN:
    1098-0121
  • Language:
    EN
  • Keywords:
    X-RAY MICROCALORIMETERS, TO-NORMAL TRANSITION, JOSEPHSON-JUNCTIONS, CURRENT-DENSITY, NOISE, SPECTROSCOPY, RELAXATION, IMBALANCE, BILAYERS, METAL
  • Addresses:
    Sadleir, JE
    Univ Illinois
    Dept Phys
    Urbana
    IL
    61801
    USA

    Univ Maryland Baltimore Cty
    Baltimore
    MD
    21250
    USA

    UCL
    London Ctr Nanotechnol
    London
    WC1E 6BT
    England

    Univ Maryland
    College Pk
    MD
    20742
    USA

    CRESST
    College Pk
    MD
    20742
    USA
Abstract
We have recently shown that normal-metal/superconductor (N/S) bilayer superconducting transition-edge sensors (TESs) exhibit weak-link behavior.(1) Here, we extend our understanding to include TESs with added noise-mitigating normal-metal structures (N structures). We find that TESs with added Au structures also exhibit weak-link behavior as evidenced by the exponential temperature dependence of the critical current and Josephson-like oscillations of the critical current with applied magnetic field. We explain our results in terms of an effect converse to the longitudinal proximity effect (LoPE),(1) the lateral inverse proximity effect (LaiPE), for which the order parameter in the N/S bilayer is reduced due to the neighboring N structures. Resistance and critical current measurements are presented as a function of temperature and magnetic field taken on square Mo/Au bilayer TESs with lengths ranging from 8 to 130 mu m with and without added N structures. We observe the inverse proximity effect on the bilayer over in-plane distances many tens of microns and find the transition shifts to lower temperatures scale approximately as the inverse square of the in-plane N-structure separation distance, without appreciable broadening of the transition width. We also present evidence for nonequilbrium superconductivity and estimate a quasiparticle lifetime of 1.8 x 10(-10) s for the bilayer. The LoPE model is also used to explain the increased conductivity at temperatures above the bilayer's steep resistive transition.
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