Quantum antiferromagnetism in the d=3 Hubbard model --- a spin-fluctuation approach
Strongly Correlated Electrons
2007-05-23 v2
Abstract
A self-consistent spin-fluctuation theory is developed to obtain T_N vs. U for the half-filled Hubbard antiferromagnet in the whole U/t range. Good agreement is obtained in the strong coupling limit with the high-temperature series-expansion result for the equivalent Heisenberg model. Quantum, spin-fluctuation correction to the sublattice magnetization is also obtained for all U at the one-loop level. A spin picture is used throughout, and quantum effects are incorporated through transverse spin fluctuations, which are evaluated in the RPA using a new method.
Keywords
Cite
@article{arxiv.cond-mat/9802047,
title = {Quantum antiferromagnetism in the d=3 Hubbard model --- a spin-fluctuation approach},
author = {Avinash Singh},
journal= {arXiv preprint arXiv:cond-mat/9802047},
year = {2007}
}
Comments
7 pages references, additional work added