Renormalization group analysis of magnetic and superconducting instabilities near van Hove band fillings

Details Renormalization group analysis of magnetic and superconducting instabilities near van Hove band fillings Renormalization group analysis of magnetic and superconducting instabilities near van Hove band fillings

2003-04-08

arxiv.org/abs/cond-mat/0304189v2

Phys. Rev. B 68, 195101 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

29 pages, 17 figures

Scientific paper

10.1103/PhysRevB.68.195101

Phase diagrams of the two-dimensional one-band t-t' Hubbard model are obtained within the two-patch and the temperature-cutoff many-patch renormalization group approach. At small t' and at van Hove band fillings antiferromagnetism dominates, while with increasing t' or changing filling antiferromagnetism is replaced by d-wave superconductivity. Near t'=t/2 and close to van Hove band fillings the system is unstable towards ferromagnetism. Away from van Hove band fillings this ferromagnetic instability is replaced by a region with dominating triplet p-wave superconducting correlations. The results of the renormalization-group approach are compared with the mean-field results and the results of the T-matrix approximation.

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