On the peculiarities of the superconductor order parameter due to the phase electron topological transition

It is shown that of under the lattice elastic strain the difference between the Fermi energy epsilonsub(F) and the critical energy epsilonsub(k), at which the electron topological transition occurs, takes value in the energy range 0 <= epsilonsub(F)-epsilonsub(k) <= ωsub(r), two types of square peculiarities appear in the dependence of the superconductor order parameter Δ(p, ω) on pulse p and frequency ω (ωsub(r)) is the characteristic frequency of the order of phonon spectrum boundary frequency). The first type of peculiarities in Δ(p, ω) is related to the fact that, according to Eliashberg equations, a layer of isoenergy surfaces epsilon(p)=epsilonsub(F)+-ω' participates in the formation of the function Δ(p, ω). The second type of peculiarities is related to the fact that the Fermi surface topology varies under the action of the elastic strains. Then two new contact points of the Fermi surface epsilon(p+q)=epsilonsub(F) portions are formed (or the old ones disappear), the points of contact being in the vicinity of the point q+p=psub(k) with phonon isoenergy surfaces ωsub(lambda)(q)=ω(psub(k) is the special point on the surface epsilon(p)=epsilonsub(k), in which v(psub(k)--gradsub(p)epsilon(p)=0)