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Sergeev, A.; Mitin, V. |
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Electron-phonon interaction in disordered conductors: Static and vibrating scattering potentials |
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2000 |
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Phys. Rev. B. |
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Phys. Rev. B. |
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61 |
Issue |
9 |
Pages |
6041-6047 |
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Keywords |
disordered conductors, scattering potential, electron-phonon interaction |
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Abstract |
Employing the Keldysh diagram technique, we calculate the electron-phonon energy relaxation rate in a conductor with the vibrating and static δ-correlated random electron-scattering potentials. If the scattering potential is completely dragged by phonons, this model yields the Schmid’s result for the inelastic electron-scattering rate τ−1e−ph. At low temperatures the effective interaction decreases due to disorder, and τ−1e−ph∝T4l (l is the electron mean-free path). In the presense of the static potential, quantum interference of numerous scattering processes drastically changes the effective electron-phonon interaction. In particular, at low temperatures the interaction increases, and τ−1e−ph∝T2/l. Along with an enhancement of the interaction, which is observed in disordered metallic films and semiconducting structures at low temperatures, the suggested model allows us to explain the strong sensitivity of the electron relaxation rate to the microscopic quality of a particular film. |
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0163-1829 |
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307 |
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Chulcova, G. M.; Ptitsina, N. G.; Gershenzon, E. M.; Gershenzon, M. E.; Sergeev, A. V. |
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Title |
Effect of the interference between electron-phonon and electron-impurity (boundary) scattering on resistivity Nb, Al, Be films |
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Conference Article |
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Year |
1996 |
Publication |
Czech J. Phys. |
Abbreviated Journal |
Czech J. Phys. |
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Volume |
46 |
Issue |
S5 |
Pages |
2489-2490 |
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Keywords |
Al, Be, Nb films |
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The temperature dependence of the resistivity of thin Nb, Al, Be films has been studied over a wide temperature range 4-300 K. We have found that the temperature-dependent correction to the residual resistivity is well described by the sum of the Bloch-Grüneisen term and the term originating from the interference between electron-phonon and electron-impurity scattering. Study of the transport interference phenomena allows to determine electron-phonon coupling in disordered metals. The interference term is proportional to T2 and also to the residual resistivity and dominates over the Bloch-Grüneisen term at low temperatures (T<40 K). |
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0011-4626 |
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