Abstract
We use a novel temperature-flow renormalization group technique to analyze magnetic and superconducting instabilities in the two-dimensional Hubbard model for particle densities close to the Van Hove filling as a function of the next-nearest-neighbor hopping . In the one-loop flow at the Van Hove filling, the characteristic temperature for the flow to strong coupling is suppressed drastically around , suggesting a quantum critical point between -wave pairing at moderate and ferromagnetism for . Upon increasing the particle density in the latter regime, the leading instability occurs in the triplet pairing channel.
- Received 11 May 2001
DOI:https://doi.org/10.1103/PhysRevLett.87.187004
©2001 American Physical Society