A consistent statistical treatment of the renormalized mean-field t-J model
Abstract
A variational treatment of the Gutzwiller - renormalized t-J Hamiltonian combined with the mean-field (MF) approximation is proposed, with a simultaneous inclusion of additional consistency conditions. Those conditions guarantee that the averages calculated variationally represent true mean-field expectation values. This is not ensured a priori when the effective Hamiltonian contains renormalization factors which depend on the mean-field averages. A comparison with previous mean-field treatments is made for both superconducting (d-RVB) and normal states and encompasses calculations of both the superconducting gap and the renormalized hopping amplitudes, as well as the electronic structure. The -symmetry breaking in the normal phase - the Pomeranchuk instability (PI) - is also analyzed.
Keywords
Cite
@article{arxiv.0908.4411,
title = {A consistent statistical treatment of the renormalized mean-field t-J model},
author = {Jakub Jȩdrak and Jozef Spałek},
journal= {arXiv preprint arXiv:0908.4411},
year = {2015}
}
Comments
5 pages, 4 figures, 2 tables. Minor typos have been fixed to make this version compatible with that published in Phys. Rev. B.