Relationships between the superconducting gap, pseudogap and transition temperature in High-T_c superconductors

Abstract

The crossover from superconducting gap to pseudogap is considered. We show that the superconductivity is destroyed at the temperature $T_c$, with the superconducting gap being smoothly transformed into the pseudogap. Relations, which are of general interest, between the maximum values of the gap ${\Delta }_1$, $T_c$ and $T^{\ast }$ are established. We presents arguments that $T^{\ast }$ as a function of the doping level $x$ is approximately a straight line that crosses the abscissa at some point $x_{FC}$. In the vicinity of this point $T^{\ast }$ coincides with $T_c$, and at $x=x_{FC}$ the fermion condensation quantum phase transition takes place.

8 pages, Revtex, 1 figure; Slightly revised version, some references are added

References in corpus (4)

• Closing the Pseudogap by Zeeman Splitting in Bi_2Sr_2CaCu_2O_8+y at High Magnetic Fields
• Quasiparticle picture of high temperature superconductors in the frame of Fermi liquid with the fermion condensate
• Theory of high-T_c superconductivity based on the fermion-condensation quantum phase transition
• Fermion-Condensation Quantum Phase Transition in High-T_c Superconductors

Cited by in corpus (3)

• Asymmetric tunneling, Andreev reflection and dynamic conductance spectra in strongly correlated metals
• Possible Universal Cause of High-T_c Superconductivity in Different Metals
• From the Bose-Einstein to Fermion Condensation