Resistance in Superconducting Transition Edge Sensors

摘要

We have measured the relation between sensor noise and the steepness#of the R dTR dI superconducting transition for various superconducting transition edge sensors. The measurements are performed on square Mo/Cu bilayer thermistors of three sizes (125 μm, 250 μm and 400 μm), which are fabricated for X-ray detection. We have identified the devices in two regimes: a) α > 100 and b) α < 100. The devices with a smaller than 100 strictly follow non-linear bolometer and micro-calorimeter noise theory while in most devices with a greater than 100, we see an unexplained noise contribution.