Van Hove Points Research Articles

High temperature superconductivity and Van Hove points

It is shown that an effective attraction arises between electrons with momenta near saddle Van Hove points in the two-dimensional repulsive Hubbard model. The formula for T c is obtained and the type of Cooper pairing near T c is determined which may be called “the superposition of pairings with odd angular momenta” (approximately this is p-pairing). The problem of competition between superconductivity and ferromagnetism is discussed.