Effects of Van Hove singularities on magnetism and superconductivity in the t-t′ Hubbard model: A parquet approach

V. Yu Irkhin, A. A. Katanin, M. I. Katsnelson

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)

Abstract

The t-t' Hubbard model for the Fermi level near the van Hove singularity is considered within the renormalization group and parquet approaches. Interplay of ferromagnetic, antiferromagnetic, and superconducting channels is investigated, and the phase diagram of the model is constructed. In comparison with previous approaches, the account of ferromagnetic fluctuations suppresses superconducting pairing and, vice versa, the influence of the Cooper channel decreases the Curie temperature, so that the Stoner criterion is inapplicable even qualitatively.

Original languageEnglish
Article number165107
Pages (from-to)1651071-16510711
Number of pages14859641
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number16
Publication statusPublished - 15 Oct 2001
Externally publishedYes

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