Quasiparticle diffusion over several mm in cryogenic detectors
2001; Elsevier BV; Volume: 465; Issue: 2-3 Linguagem: Inglês
10.1016/s0168-9002(01)00621-0
ISSN1872-9576
AutoresM. Loidl, S. J. Cooper, Oliver Meier, F. Pröbst, György Sáfrán, W. Seidel, M. Sisti, L. Stodolsky, S. Uchaikin,
Tópico(s)Advanced Thermoelectric Materials and Devices
ResumoThe use of quasiparticle diffusion in a superconducting film has the potential to allow an increase in the size of a cryogenic detector without proportional loss of energy resolution. The quasiparticle lifetime and the diffusion constant are critical parameters which have limited this development. Using W superconducting phase transition thermometers as the sensors and a W/Al bilayer as the diffusion film, we have measured quasiparticle diffusion over a distance of 2mm and deduced a diffusion constant of D=2.5×10−4m2/s and a quasiparticle lifetime of τ=9.0ms, which is, to our knowledge, by far the longest ever observed. With Ir/Au thermometers and an Ir/Au/Al diffusion film we found D=4.6×10−3m2/s and τ=0.43ms with diffusion over 4mm, the longest distance observed to date.
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