Signatures of next-nearest-neighbor (NNN) Antiferromagnetic Exchange Interaction on High-T c Superconductivity Within t-t'-J-J' Model

Abstract

The influence of the next-nearest-neighbor (NNN) antiferromagnetic interaction J' has been examined within t - t' - J - J' model in an exact technique. An 8-site square cluster is chosen as the representative of the system. The effect of the next-nearest-neighbor (NNN) antiferromagnetic interaction on various ground state properties such as electron-electron correlation, spin-spin correlation, effective hopping amplitude etc. has been studied. Temperature variation of the susceptibility shows that J' suppresses short range antiferromagnetic order. Applying periodic boundary conditions, the calculations have been extended beyond the 8-site limit.