Abstract
We have used symmetric normal metal-insulator-superconductor (NIS) tunnel junction pairs, known as SINIS structures, for ultrasensitive thermometry in the temperature range . By Joule heating the electron gas and measuring the electron temperature, we show that the electron-phonon scattering rate in the simplest noble-metal disordered thin films (Cu,Au) follows a temperature dependence, leading to a stronger decoupling of the electron gas from the lattice at the lowest temperatures. This power law is indicative coupling mediated by vibrating disorder, in contrast to the previously observed and laws.
- Received 18 April 2005
DOI:https://doi.org/10.1103/PhysRevB.72.012302
©2005 American Physical Society