Pseudogap and Superconducting Fluctuation in High-Tc Cuprates: Theory beyond 1-loop Approximation

Abstract

The pseudogap phenomena induced by the SC fluctuation are investigated in details. We perform a calculation beyond the 1-loop approximation. The SC fluctuation is microscopically derived on the basis of the repulsive Hubbard model. The vertex corrections are collected in the infinite order with use of the quasi-static approximation. The single-particle excitations, NMR 1/T_{1}T, spin susceptibility and superconducting transition temperature are discussed. The important role of the vertex correction is pointed out for the single particle spectral function. On the other hand, the validity of the 1-loop order theory is confirmed for other quantities. We shed light on the essential nature of SC fluctuation leading to the pseudogap from the comparison with spin and charge fluctuations.

References in corpus (2)

• Theory of Superconductivity in Strongly Correlated Electron Systems
• On Migdal's theorem and the pseudogap

Cited by in corpus (8)

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• Localization and Superconductivity in Doped Semiconductors
• Kinetic Energy, Condensation Energy, Optical Sum Rule and Pairing Mechanism in High-Tc Cuprates
• Superconducting Fluctuation and Pseudogap in Disordered Short Coherence Length Superconductor
• Central peak in the pseudogap of high T_c superconductors
• Two-Particle-Self-Consistent Approach for the Hubbard Model
• Pseudogap in electron-doped cuprates: thermal precursor to magnetism