Electron-phonon interaction in thin copper and gold films

Details Electron-phonon interaction in thin copper and gold films Electron-phonon interaction in thin copper and gold films

2004-10-12

arxiv.org/abs/cond-mat/0410281v1

Phys. Stat. Solidi (c) 1, 2799 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

to appear in Phys. Stat. Solidi (2005)

Scientific paper

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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