The role of the Coulomb interaction in the formation of superconducting and pseudogap states in cuprate metal-oxides

• Veröffentlicht in: Физика низких температур
• Datum: 2006
• Hauptverfasser: Pashitskii, E.A., Pentegov, V.I.
• Format: Artikel
• Sprache: Englisch
• Veröffentlicht: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2006
• Schlagworte: Pseudogap
• Online Zugang: https://nasplib.isofts.kiev.ua/handle/123456789/120194
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Zitieren: The role of the Coulomb interaction in the formation of
 superconducting and pseudogap states
 in cuprate metal-oxides / E.A. Pashitskii, V.I. Pentegov // Физика низких температур. — 2006. — Т. 32, № 4-5. — С. 596–601. — Бібліогр.: 15 назв. — англ.

It is shown that the key role in the mechanism of high-Tc superconductivity in the layered
 cuprate metal-oxides with anisotropic quasi-two-dimensional electronic spectrum and d-wave symmetry
 of the superconducting order parameter is played by the retarded screened Coulomb interaction
 and many-body correlations. We argue that the pseudogap observed in these materials is the
 anisotropic dielectric gap, which appears due to the electron-hole pairing on the flat portions of
 the Fermi surface in the vicinity of the extended saddle points in the quasiparticle spectrum. This
 gap coexists with the superconducting gap and is partially suppressed by scattering of current carriers
 on the charged point defects. The suppression of dielectric gap is analogous to the suppression
 of superconducting gap by magnetic impurities in «gapless» superconductors. The complete destruction
 of the pseudogap by charged impurities is assumed to increase Tc significantly.