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

A. Katanin, P. Kampf

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)

Abstract

Phase diagrams of the two-dimensional one-band t-t′ Hubbard model are obtained within the two-patch and temperature-cutoff many-patch renormalization group approaches. 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.

Original languageEnglish
Article number195101
Pages (from-to)1951011-19510112
Number of pages17559102
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume68
Issue number19
DOIs
Publication statusPublished - Nov 2003
Externally publishedYes

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