Volume 42, Number 6, June II 1998
|Page(s)||655 - 660|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Enhancement of long-range antiferromagnetic order by nonmagnetic impurities in the Hubbard model
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
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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