Back to Search
Start Over
Thermal fluctuation noise in Mo/Au superconducting transition-edge sensor microcalorimeters.
- Source :
- Journal of Applied Physics; 2019, Vol. 125 Issue 16, pN.PAG-N.PAG, 10p, 2 Diagrams, 8 Graphs
- Publication Year :
- 2019
-
Abstract
- In many superconducting transition-edge sensor (TES) microcalorimeters, the measured electrical noise exceeds theoretical estimates based on a thermal model of a single body thermally connected to a heat bath. Here, we report on noise and complex impedance measurements of a range of designs of TESs made with a Mo/Au bilayer. We have fitted the measured data using a two-body model, where the x-ray absorber and the TES are connected by an internal thermal conductance G<subscript>ae</subscript>. We find that the so-called excess noise measured in these devices is consistent with the noise generated from the internal thermal fluctuations between the x-ray absorber and the TES. Our fitted parameters are consistent with the origin of G<subscript>ae</subscript> being from the finite thermal conductance of the TES itself. These results suggest that even in these relatively low resistance Mo/Au TESs, the internal thermal conductance of the TES may add significant additional noise and could account for all the measured excess noise. Furthermore, we find that around regions of the superconducting transition with rapidly changing derivative of resistance with respect to temperature, an additional noise mechanism may dominate. These observations may lead to a greater understanding of TES devices and allow the design of TES microcalorimeters with improved performance. [ABSTRACT FROM AUTHOR]
- Subjects :
- CALORIMETERS
DETECTORS
SUPERCONDUCTING transitions
NOISE
TEMPERATURE
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 125
- Issue :
- 16
- Database :
- Complementary Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 136185425
- Full Text :
- https://doi.org/10.1063/1.5086045