Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-02-22
Ann. Physik 7, 48 (1998)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages revtex, 5 eps figures; typos corrected and a discussion about the applicability to two-dimensional organic superconduc
Scientific paper
The perfect-nesting instability towards antiferromagnetism of the Hubbard model is suppressed by next-nearest neighbor hopping t'. The exact asymptotic behavior of the critical coupling U_c(t') at small t' is calculated in dimensions d=2,3 and infinity using Hartree theory, and the order of the transition is determined. A region of stability of a metallic antiferromagnetic phase in d=3 is identified.
Hofstetter Walter
Vollhardt Dieter
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