Measurement of Electron-Phonon Interactions in a Gold Film on a Quartz Substrate

摘要

We have measured the electron-phonon interaction in a 2000 A thick gold film on a quartz substrate in the temperature range of 30 to 200 mK. The magnetization of two small erbium-doped gold sensors was used to determine the temperature of the electrons in the Au and the phonons in the quartz independently. A value of 3.7 X 10~(9) W m~(-3) K~(-5) was obtained for the electron-phonon coupling constant. This result provides further evidence that electron-phonon interactions in thin films at low temperatures are dependent upon the properties of the substrate.