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Open Access Publications from the University of California

Modeling Iridium-Based Trilayer and Bilayer Transition-Edge Sensors

  • Author(s): Wang, G
  • Beeman, J
  • Chang, CL
  • Ding, J
  • Drobizhev, A
  • Fujikawa, BK
  • Han, K
  • Han, S
  • Hennings-Yeomans, R
  • Karapetrov, G
  • Kolomensky, YG
  • Novosad, V
  • O'Donnell, T
  • Ouellet, JL
  • Pearson, J
  • Sheff, B
  • Singh, V
  • Wagaarachchi, S
  • Wallig, JG
  • Yefremenko, VG
  • et al.

We report a model that can be used to calculate superconducting transition temperature of a transition-edge sensor (TES), which is either a normal metal-superconductor-normal metal trilayer or a normal metal-superconductor bilayer. The model allows the T-{C} estimation of a trilayer when the normal metals at the bottom and at the top are different. Furthermore, the model includes the spin flip time of the normal metals. We use the T-{C} calculations from this model for selected Ir-based trilayers and bilayers to help understand potential designs of low T-{C} TESs. A Au/Ir/Au trilayer can have a low T-{C} because the superconducting order parameter is reduced with normal metals at both sides. On the other hand, an Ir/Pt bilayer can have a low T-{C} because the much larger electron density of states of Pt reduces the superconducting order parameter more effectively. Moreover, the spin flip scattering of paramagnetic Pt also contributes to the T-{C} reduction.

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