Thermoelectric effects in point-contact junctions in the thermal limit
I. F. ItskovichPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovMichael MoskaletsPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovR. I. ShekhterPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovI. O. KulikPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kov
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The theory of nonlinear electric conductivity of small point contacts between different metallic electrodes (heterojunctions) is constructed. The maximum of the temperature distribution obtained for short mean free paths of electrons and phonons lies in the material with lower electric conductivity. Nonlinear corrections to the current-voltage characteristics (IVC) due to the electron-phonon interaction (symmetric part) and thermoelectric (Seebeck) effect (asymmetric part) are calculated. Nonlinearity of IVC caused by structural transformations and resulting in the heating of the contact region is also analyzed.
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