Magnetic and superconducting instabilities of the Hubbard model at the van Hove filling

Details Magnetic and superconducting instabilities of the Hubbard model at the van Hove filling Magnetic and superconducting instabilities of the Hubbard model at the van Hove filling

2001-09-21

arxiv.org/abs/cond-mat/0109392v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, to appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.87.187004

We use a novel temperature-flow renormalization group technique to analyze magnetic and superconducting instabilities in the two-dimensional t-t' Hubbard model for particle densities close to the van Hove filling as a function of the next-nearest neighbor hopping t'. In the one-loop flow at the van Hove filling, the characteristic temperature for the flow to strong coupling is suppressed drastically around t'_c approx. -0.33t, suggesting a quantum critical point between d-wave pairing at moderate t'>t'_c and ferromagnetism for t'

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