Logarithmic Correction Terms of the Magnetic Susceptibility in Highly Correlated Electron Systems

Abstract

The logarithmic correction terms in the repulsive Hubbardchain is investigated by using the Bethe Ansatz. The magneticsusceptibility χ of this model has a field dependent logarithmiccorrection term in small magnetic field at zero-temperature. This termcauses ∂ χ /∂ h|_{h=0}=∞ . In arbitrary nand U the existence of the logarithmic correction term is shown forthe susceptibility. We consider how this term depends on n and U. Wealso discuss the logarithmic correction term of the super-symmetric t-J model.