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| VOLUME 27 (1978) | ISSUE 11 |
PAGE 612
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Singularities of the energy "gap" of a superconductor
Makarov V.I.
The existence of singularities in the energy "gap" Δ(ρ,ω) in (ρ,ω) space is predicted. It is shown that in the general case the singularities in Δ(ρ,ω) are due to a change in the topology of the line of intersection of the Fermi surface with the phonon equal-energy surfaces.
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![](/ps/1554/article_23784_800_head.png "<b>The existence of singularities in the energy "gap" Δ(ρ,ω) in (ρ,ω) space is predicted. It is shown that in the general case the singularities in Δ(ρ,ω) are due to a change in the topology of the line of intersection of the Fermi surface with the phonon equal-energy surfaces.</b>")