Competing phases in the extended U-V-J Hubbard model near the Van Hove fillings

A. P. Kampf, A. A. Katanin

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51 Citations (Scopus)

Abstract

The phase diagram of the two-dimensional extended one-band U-V-J Hubbard model is considered within a mean-field approximation and two- and many-patch renormalization-group (RG) approaches near the Van Hove band fillings. At small t′ and J>0, mean-field and many-patch RG approaches give similar results for the leading spin-density-wave (SDW) instability, while the two-patch RG approach that predicts a wide region of charge-flux (CF) phase becomes unreliable due to nesting effect. There is a complex competition between SDW, CF phases, and d-wave superconductivity at small t′ in two- and many-patch RG approaches. The spin-flux phase, which is not stable at the mean-field level, is identified as a possible ground state at J<0 in both RG approaches. With increasing t′ the results of all three approaches merge: d-wave superconductivity at J>0 and ferromagnetism at J<0 become the leading instabilities. For large enough V, the charge-density-wave state occurs.

Original languageEnglish
Article number125104
Pages (from-to)1251041-12510414
Number of pages11259374
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume67
Issue number12
Publication statusPublished - Mar 2003
Externally publishedYes

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