Two gaps with one energy scale in cuprate superconductors
Shiping Feng, Huaisong Zhao, Zheyu Huang
DOI 10.1103/PhysRevB.85.054509 · Physical Review B
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Abstract
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 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.
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