Superconducting transition edge sensor using dilute AlMn alloys

Deiker, S. W.; Doriese, W.; Hilton, G. C.; Irwin, K. D.; Rippard, W. H.; Ullom, J. N.; Vale, L. R.; Ruggiero, S. T.; Williams, A.; Young, B. A.
September 2004
Applied Physics Letters;9/13/2004, Vol. 85 Issue 11, p2137
Academic Journal
We have fabricated a bolometer using a transition-edge sensor (TES) made of Al doped with Mn to suppress the superconducting critical temperature (Tc) of Al from ∼1 K to ∼100 mK. The resulting detector exhibits low-frequency noise consistent with theory, with a noise-equivalent power of 7.5×10-18 W/[Square_Root]Hz. The addition of Mn impurities did not significantly increase the heat capacity of the TES. In addition, the detector is surprisingly insensitive to applied magnetic fields. The use of AlMn alloy films in arrays of TES detectors has advantages in simplicity of fabrication when compared to traditional bilayer fabrication techniques.


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