Point-contact spectroscopy in copper: temperature measurements. Dependence of point-contact spectra on contact parameters
A. I. AkimenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovA. B. VerkinPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovN. M. PonomarenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovI. K. YansonPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kov
ABI
Abstract
Measurements of the temperature dependence of the point-contact resistance R(T) are used to determine the effective contact size d and the mean free path li of an electron in the neighborhood of the contact. The dependence of the parameters of point-contact spectra on li and d is studied. The experimental results are compared with the predictions of a theoretical model for reabsorption of nonequilibrium phonons. This allows the temperature of the nonequilibrium phonons to be estimated (near the L peak the temperature is about 70–80 °K). The observed dependence R(T) ∼T4 for 20 < T <40°K is explained by single-phonon Umklapp processes, which make the greatest contribution to the point-contact spectrum of copper.
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