| Issue |
Europhys. Lett.
Volume 37, Number 3, January III 1997
|
|
|---|---|---|
| Page(s) | 219 - 224 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1997-00134-y | |
| Published online | 01 September 2002 | |
Restricted path integral approach to the doped Hubbard model
Department of Theoretical Physics, Royal Institute of Technology, S-100 44 Stockholm, Sweden
Received:
2
December
1996
Accepted:
5
December
1996
We present a restricted path integral approach to the 2D repulsive Hubbard model. It amounts to evaluating the partition function by restricting the summation over states to a small subclass and generalizes mean-field theory. Analyzing the simplest of these approximations, we find a mixed phase of fermions with local antiferromagnetic correlations coexisting with conventional metallic fermions. This mixed phase persists in a big parameter regime. We also discuss a refinement of our approximation which suggests simple explanations of several peculiar experimental features of HTSC.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 21.60.Jz – Hartree-Fock and random-phase approximations / 74.72.-h – High-Tc compounds
© EDP Sciences, 1997
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.