Self-energy effects in cuprates and the dome-shaped behavior of the superconducting critical temperature

GUILLERMO BUZON; A. FOUSSATS; MATÍAS BEJAS; ANDRÉS GRECO

PHYSICAL REVIEW B

AMER PHYSICAL SOC

Lugar: New York; Año: 2014 vol. 89 p. 1 - 11

1098-0121

Hole doped cuprates show a superconducting critical temperature Tc which follows an universal dome-shaped behavior as function of doping. It is believed that the origin of superconductivity in cuprates is entangled with the physics of the pseudogap phase. An open discussion is whether thesource of superconductivity is the same that causes the pseudogap  properties. The t-J model treated in large-N expansion shows d-wave superconductivity triggered by non-retarded interactions, and aninstability of the paramagnetic state to a flux phase or d-wave charge density wave (d-CDW) state. In this paper we show that self-energy effects near d-CDW instability may lead to a dome-shaped behavior of Tc . In addition, it is also shown that these self-energy contributions may describe several properties observed in the pseudogap phase. In this picture, although fluctuations responsible for the pseudogap properties leads to a dome-shaped behavior, they are not involved in pairing which is mainly non-retarded.