Magnetic properties of the 2D t-t'-Hubbard model
Condensed Matter
2016-08-31 v1
Abstract
The two-dimensional (2D) t-t'-Hubbard model is studied within the slave-boson (SB) theory. At half-filling, a paramagnetic to antiferromagnetic phase transition of first order at a finite critical interaction strength U_c(t'/t) is found. The dependences on U/t and t'/t of the sublattice magnetization and of the local magnetic moment are calculated. Our results reasonably agree with recent (Projector) Quantum Monte Carlo data. The SB ground-state phase diagram reveals a t'-induced electron-hole asymmetry, and, depending on the ratio t'/t, the antiferromagnetic or ferromagnetic phases are stable down to U=0 at a critical hole doping.
Keywords
Cite
@article{arxiv.cond-mat/9612181,
title = {Magnetic properties of the 2D t-t'-Hubbard model},
author = {U. Trapper and H. Fehske and D. Ihle},
journal= {arXiv preprint arXiv:cond-mat/9612181},
year = {2016}
}
Comments
2 pages, 3 Postscript figure, submitted to Int. Conf. M2S-HTSC-V Beijing 97, to appear in Physica C