Fluctuation-Limited Noise in a Superconducting Transition-Edge Sensor

A. Luukanen; K. M. Kinnunen; A. K. Nuottajärvi; H. F. C. Hoevers; W. M. Bergmann Tiest; J. P. Pekola

doi:10.1103/PhysRevLett.90.238306

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Fluctuation-Limited Noise in a Superconducting Transition-Edge Sensor

A. Luukanen, K. M. Kinnunen, A. K. Nuottajärvi, H. F. C. Hoevers, W. M. Bergmann Tiest, J. P. Pekola

DOI 10.1103/PhysRevLett.90.238306 · Physical Review Letters

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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, with superconducting contacts in the center 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ti/Au Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.1	Pressure not reported	unknown
Mo/Cu Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.1	Pressure not reported	unknown
Mo/Au Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.1	Pressure not reported	unknown
Ti Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.123	Pressure not reported	midpoint