Antiadiabatic Theory of Superconducting State Transition: Phonons and Strong Electron Correlations—The Old Physics and New Aspects

Figure 4

Corrected DOS and gap formation near 𝐤 point where particular bands intersect FL, 0 K. Gap of YBa₂Cu₃O₇ in Γ-Y(4a) and Γ-X(4b) direction. Half-gap in MgB₂ (Figure 4(c)) and half-gap in YB₆ (Figure 4(d)).

(a)

(b)

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(d)