| Issue |
Europhys. Lett.
Volume 42, Number 6, June II 1998
|
|
|---|---|---|
| Page(s) | 655 - 660 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00301-2 | |
| Published online | 01 September 2002 | |
Enhancement of long-range antiferromagnetic order by nonmagnetic impurities in the Hubbard model
1
Theoretische Physik III, Elektronische Korrelationen und Magnetismus,
Institut für Physik, Universität Augsburg - D 86135 Augsburg, Germany
2
Lorentz Institute for Theoretical Physics, University of Leiden,
P.O. Box 9506, 2300 RA Leiden, The Netherlands
3
Department of Physics, University of California - Davis, CA 95616, USA
Received:
31
October
1997
Accepted:
4
May
1998
The two-dimensional Hubbard model with a bimodal distribution of
on-site interactions, 
,
is studied using finite-temperature Quantum Monte Carlo
and dynamical mean-field theory.
Long-range antiferromagnetic order off
half-filling is stabilized by the disorder,
due to localization of
the dopants on the U=0 sites.
Whereas in the clean model there is a single gap at n=1,
for nonzero f we find
the compressibility and density of states
exhibit gaps at two separate fillings.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 71.30.+h – Metal-insulator transitions and other electronic transitions
© EDP Sciences, 1998
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