Renormalization of the electron-spin-fluctuation interaction in the t-t'-U Hubbard model

Abstract

We study the renormalization of the electron-spin-fluctuation (el-sp) vertex in a two-dimensional Hubbard model with nearest-neighbor (t) and next-nearest-neighbor (t') hopping by a Quantum-Monte-Carlo calculation. Our results show that for t'=0, the renormalized el-sp vertex decreases quite generally with decreasing temperature at all spin-fluctuation momentum transfers. The suppression of the el-sp vertex results in a substantial reduction of the effective pairing interaction mediated by antiferromagnetic spin fluctuations in both the intermediate- and strong-correlation regimes. The inclusion of a finite t'/t<0, increases the Landau damping rate of spin fluctuations, especially in the overdoped region. The increased damping rate leads to smaller vertex corrections, in agreement with earlier diagrammatic calculations. Still, the vertex correction reduces the spin-fermion vertex, as at t'=0.

arXiv comment7 pages, 7 figures

References in corpus (12)

• Coupling strength of charge carriers to spin fluctuations in high-temperature superconductors
• The neutron resonance: modeling photoemission and tunneling data in the superconducting state of Bi_2Sr_2CaCu_2O_{8+d}
• Anomalous low doping phase of the Hubbard model
• Electronic structure of underdoped cuprates
• Pseudogaps and their Interplay with Magnetic Excitations in the doped 2D Hubbard Model
• The neutron resonance in the cuprates and its effect on fermionic excitations
• What the resonance peak cannot do
• Electron-phonon vertex in the two-dimensional one-band Hubbard model
• Dispersion Anomalies in Cuprate Superconductors
• Superconducting Spiral Phase in the two-dimensional t-J model
• On the vertex corrections in antiferromagnetic spin fluctuation theories
• Role of vertex corrections in the spin-fluctuation mediated pairing mechanism

Cited by in corpus (8)

• Strength of the Spin-Fluctuation-Mediated Pairing Interaction in a High-Temperature Superconductor
• Paramagnon-induced dispersion anomalies in the cuprates
• Systematic analysis of a spin-susceptibility representation of the pairing interaction in the 2D Hubbard model
• Explaining the pseudogap through damping and antidamping on the Fermi surface by imaginary spin scattering
• The superconducting gap in the Hubbard model and the two gap energy scales in high-Tc cuprates
• Spin Susceptibility Representation of the Pairing Interaction for the two-dimensional Hubbard Model
• Spin-fluctuation glue disfavors high-critical temperature of superconductivity?
• Pairing boost from enhanced spin-fermion coupling in the pseudogap regime