Enhancement of superconducting transition temperature by the additional second neighbor hopping t' in the t-J model

Details Enhancement of superconducting transition temperature by the additional second neighbor hopping t' in the t-J model Enhancement of superconducting transition temperature by the additional second neighbor hopping t' in the t-J model

2005-06-05

arxiv.org/abs/cond-mat/0506114v2

Phys. Lett. A 350, 138-146 (2006)

Physics

Condensed Matter

Superconductivity

8 pages, 4 figures, added discussions and references, accepted for publication in Physics Letters A

Scientific paper

10.1016/j.physleta.2005.09.078

Within the kinetic energy driven superconducting mechanism, the effect of the additional second neighbor hopping t' on the superconducting state of the t-J model is discussed. It is shown that t' plays an important role in enhancing the superconducting transition temperature of the t-J model. It is also shown that the superconducting-state of cuprate superconductors is the conventional Bardeen-Cooper-Schrieffer like, so that the basic Bardeen-Cooper-Schrieffer formalism is still valid in quantitatively reproducing the doping dependence of the superconducting gap parameter and superconducting transition temperature, and electron spectral function at $(\pi,0)$ point, although the pairing mechanism is driven by the kinetic energy by exchanging dressed spin excitations.

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