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Electron-phonon interaction in thin copper and gold films

J. T. Karvonen·L. J. Taskinen·I. J. Maasilta
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Abstract

We have studied the electron-phonon (e-p) interaction in thin Cu and Au films at sub-Kelvin temperatures with the help of the hot electron effect, using symmetric normal metal-insulator-superconductor tunnel junction pairs as thermometers. By Joule heating the electron gas and measuring the electron and the lattice temperatures simultaneously, we show that the electron-phonon scattering rate follows a $T^{4}$ temperature dependence in both metals. The result is in accordance with the theory of e-p scattering in disordered films with vibrating boudaries and impurities, in contrast to the $T^{3}$-law expected for pure samples, and $T^{2}$-law for static disorder.

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J. T. Karvonen, L. J. Taskinen, I. J. Maasilta. 2004-10-12. Electron-phonon interaction in thin copper and gold films. https://doi.org/10.1002/pssc.200405326

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