Fluctuation superconductivity limited noise in a transition-edge sensor

TL;DR

This paper investigates excess noise in transition-edge sensors by developing an edgeless Corbino disk geometry, modeling the noise as resistance fluctuations near the superconductor-normal boundary.

Contribution

It introduces a novel Corbino disk geometry for TESs to better understand and reduce excess noise related to boundary fluctuations.

Findings

Measured noise can be modeled as resistance noise from boundary fluctuations.

Corbino geometry reduces uncontrollable phenomena at the transition.

Provides insights into noise origins in TES devices.

Abstract

In order to investigate the origin of the until now unaccounted excess noise and to minimize the uncontrollable phenomena at the transition in X-ray microcalorimeters we have developed superconducting transition-edge sensors into an edgeless geometry, the so-called Corbino disk (CorTES), with superconducting contacts in the centre and at the outer perimeter. The measured rms current noise and its spectral density can be modeled as resistance noise resulting from fluctuations near the equilibrium superconductor-normal metal boundary