Magnetic and pair correlations of the Hubbard model with next-nearest-neighbor hopping

Details Magnetic and pair correlations of the Hubbard model with next-nearest-neighbor hopping Magnetic and pair correlations of the Hubbard model with next-nearest-neighbor hopping

1995-07-14

arxiv.org/abs/cond-mat/9507045v1

Phys. Rev. B 52, 16 255 - 16 263 (1995) (9 pages).

Physics

Condensed Matter

Revtex, 8 pages + 15 uuencoded postcript figures

Scientific paper

10.1103/PhysRevB.52.16255

A combination of analytical approaches and quantum Monte Carlo simulations is used to study both magnetic and pairing correlations for a version of the Hubbard model that includes second-neighbor hopping $t^{\prime }=-0.35t$ as a model for high-temperature superconductors. Magnetic properties are analyzed using the Two-Particle Self-Consistent approach. The maximum in magnetic susceptibility as a function of doping appears both at finite $% t^{\prime }$ and at $t^{\prime }=0$ but for two totally different physical reasons. When $t^{\prime }=0$, it is induced by antiferromagnetic correlations while at $t^{\prime }=-0.35t$ it is a band structure effect amplified by interactions. Finally, pairing fluctuations are compared with $% T $-matrix results to disentangle the effects of van Hove singularity and of nesting on superconducting correlations. The addition of antiferromagnetic fluctuations increases slightly the $d$-wave superconducting correlations despite the presence of a van Hove singularity which tends to decrease them in the repulsive model. Some aspects of the phase diagram and some subtleties of finite-size scaling in Monte Carlo simulations, such as inverted finite-size dependence, are also discussed.

Affiliated with

Also associated with

No associations

Rating

Magnetic and pair correlations of the Hubbard model with next-nearest-neighbor hopping does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Magnetic and pair correlations of the Hubbard model with next-nearest-neighbor hopping, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic and pair correlations of the Hubbard model with next-nearest-neighbor hopping will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-723535