1109.3973 (Shiping Feng et al.)

Two gaps with one energy scale in cuprate superconductors    [PDF]

Shiping Feng, Huaisong Zhao, Zheyu Huang

The interplay between the superconducting gap and normal-state pseudogap in
cuprate superconductors is studied based on the kinetic energy driven
superconducting mechanism. It is shown that the interaction between charge
carriers and spins directly from the kinetic energy by exchanging spin
excitations in the higher power of the doping concentration induces the
normal-state pseudogap state in the particle-hole channel and superconducting
state in the particle-particle channel, therefore there is a coexistence of the
superconducting gap and normal-state pseudogap in the whole superconducting
dome. This normal-state pseudogap is closely related to the quasiparticle
coherent weight, and is a necessary ingredient for superconductivity in cuprate
superconductors. In particular, both the normal-state pseudogap and
superconducting gap are dominated by one energy scale, and they are the result
of the strong electron correlation.

View original: http://arxiv.org/abs/1109.3973