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Books > Science & Mathematics > Physics > States of matter > Condensed matter physics (liquids & solids)
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Atlas of Point Contact Spectra of Electron-Phonon Interactions in Metals (Hardcover, 1995 ed.)
Loot Price: R4,293
Discovery Miles 42 930
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Atlas of Point Contact Spectra of Electron-Phonon Interactions in Metals (Hardcover, 1995 ed.)
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The characteristics of electrical contacts have long attracted the
attention of researchers since these contacts are used in every
electrical and electronic device. Earlier studies generally
considered electrical contacts of large dimensions, having regions
of current concentration with diameters substantially larger than
the characteristic dimensions of the material: the interatomic
distance, the mean free path for electrons, the coherence length in
the superconducting state, etc. [110]. The development of
microelectronics presented to scientists and engineers the task of
studying the characteristics of electrical contacts with
ultra-small dimensions. Characteristics of point contacts such as
mechanical stability under continuous current loads, the magnitudes
of electrical fluctuations, inherent sensitivity in radio devices
and nonlinear characteristics in connection with electromagnetic
radiation can not be understood and altered in the required way
without knowledge of the physical processes occurring in contacts.
Until recently it was thought that the electrical conductivity of
contacts with direct conductance (without tunneling or
semiconducting barriers) obeyed Ohm's law. Nonlinearities of the
current-voltage characteristics were explained by joule heating of
the metal in the region of the contact. However, studies of the
current-voltage characteristics of metallic point contacts at low
(liquid helium) temperatures [142] showed that heating effects were
negligible in many cases and the nonlinear characteristics under
these conditions were observed to take the form of the energy
dependent probability of inelastic electron scattering, induced by
various mechanisms.
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