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Fluctuation-limited noise in a superconducting transition-edge sensor.
A Luukanen1, K M Kinnunen, A K Nuottajärvi
1Department of Physics, University of Jyväskylä, P.O. Box 35 (YFL) FIN-40014 University of Jyväskylä, Finland.
Physical Review Letters
|July 15, 2003
Summary
Researchers developed novel Corbino disk transition-edge sensors to investigate excess noise in x-ray microcalorimeters. The new design helps minimize uncontrollable transition phenomena by modeling noise as resistance fluctuations.
Area of Science:
- Physics
- Materials Science
- Electrical Engineering
Background:
- X-ray microcalorimeters are crucial for sensitive detection but suffer from excess noise.
- Uncontrollable phenomena at the superconductor-normal metal transition limit performance.
Purpose of the Study:
- Investigate the origin of unaccounted excess noise in transition-edge sensors.
- Minimize uncontrollable phenomena in x-ray microcalorimeter transitions.
Main Methods:
- Developed superconducting transition-edge sensors in an edgeless Corbino disk geometry.
- Utilized superconducting contacts at the center and outer perimeter.
- Measured rms current noise and spectral density.
Main Results:
- The Corbino disk geometry was successfully implemented.
- Measured noise and spectral density align with resistance noise models.
- Fluctuations near the superconductor-normal metal boundary are identified as the noise source.
Conclusions:
- The Corbino disk design offers a pathway to understanding and mitigating noise in transition-edge sensors.
- Identified resistance noise from superconductor-normal metal boundary fluctuations as the key factor.
- This work contributes to improving the sensitivity and reliability of x-ray microcalorimeters.