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Modeling Iridium-Based Trilayer and Bilayer Transition-Edge Sensors
- Wang, Gensheng;
- Beeman, Jeffrey;
- Chang, Clarence L;
- Ding, Junjia;
- Drobizhev, A;
- Fujikawa, BK;
- Han, K;
- Han, S;
- Hennings-Yeomans, R;
- Karapetrov, Goran;
- Kolomensky, Yury G;
- Novosad, Valentyn;
- O'Donnell, T;
- Ouellet, JL;
- Pearson, John;
- Sheff, B;
- Singh, V;
- Wagaarachchi, S;
- Wallig, JG;
- Yefremenko, Volodymyr G
- et al.
Published Web Location
https://doi.org/10.1109/tasc.2016.2646373Abstract
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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