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

doi:10.1103/PhysRevB.64.165107

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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

DOI 10.1103/PhysRevB.64.165107 · Physical Review B

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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.

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Formula	Reported Tc (K)	Pressure (GPa)	Type
Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown