Renormalization group analysis of magnetic and superconducting instabilities near van Hove band fillings
A. A. Katanin, A. P. Kampf
DOI 10.1103/PhysRevB.68.195101 · Physical Review B
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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.
Source-reported materials — not catalogue approval
| 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 |
| Sr2-xLaxRuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Ca2RuO4 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 |
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