Abstract
Alternating current of frequency ω generates heat in a metal film oscillating with the frequency 2ω. Due to the temperature dependence of the resistance, the voltage across the film has a V3ω-component oscillating with the frequency 3ω. In the present paper the amplitude and phase of the V3ω-component are calculated on the basis of the equation for electron temperature. It is shown that for sufficiently long films on dielectric substrates with high thermal conductivity, both the average time of phonon escape from the film τes and the time of electron-phonon collisions τe can be found from the frequency dependence of the amplitude and phase of the V3ω-component.
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