Disorder-induced microscopic inhomogeneity in the multi-critical region of d-wave superconductivity and anti-ferromagnetism

We investigate the role of disorder in the multi-critical region of d-wave superconductivity and anti-ferromagnetism on the basis of the microscopic t-t'-U-V model. The model is analyzed by using the self-consistent FLEX + T-matrix approximation which has been developed to include the SC fluctuation into the FLEX approximation. We adopt the formulation in the real space and exactly take into account the disorder. We discuss the spatial dependence of NMR 1/T1T and uniform susceptibility. (C) 2007 Elsevier B.V. All rights reserved.