It is shown that the conductance G of a quantum microconstriction in a metal with an open Fermi surface undergoes jumps of the opposite sign as a function of the contact diameter. The negative jumps are a result of the limitation of the energy of the electron motion along the direction in which the Fermi surface is open. The point contact spectrum of such a constriction has additional peaks at the bias eV where the maximum energy of the quantum subband is equal to the energies is the Fermi energy).
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