On the nature and key role of the pseudogap in HTSC cuprates. 30 years later (comments on S.I. Vedeneev's paper "Pseudogap problem in high-temperature superconductors" Phys. Usp. 64 890 (2021), Usp. Fiz. Nauk 191 937 (2021))

This letter demonstrates that the nature of the pseudogap in cuprate high-temperature superconductors (HTSCs) is not “mysterious” (as described in a recent review by S.I. Vedeneev “The problem of a pseudogap in HTSCs”, UFN 191 937 (2021)), but is determined by the magnetic ( AF SDW) phase transition in the normal state, discovered by us 30 years ago. This transition is accompanied by the formation of a dielectric gap at symmetrical parts of the Fermi surface (pseudogap). The rest of the Fermi surface remains to be free for superconducting pairing. The key role of the pseudogap in cuprates is due to an increase in Tc due to an increase in the density of states at its edges - the suppression of the pseudogap leads to the disappearance of the HTSC in the system.