Bulletin of Pure & Applied Sciences- Physics
  • Year: 2020
  • Volume: 39d
  • Issue: 1

Effect of next-nearest-neighbor (NNN) hopping and exchange interactions on High-Tc superconductivity

1Department of Physics, University of Kalyani, Kalyani, West Bengal, 741235, India

2Department of Physics, University of Kalyani, Kalyani, West Bengal, 741235, India

*Corresponding author: N. K. Ghosh, Department of Physics, University of Kalyani, Kalyani, West Bengal, 741235, India E-mail: nkg@klyuniv.acin

Online published on 10 August, 2020.

Abstract

To investigate the effect of next-nearest-neighbor (NNN) hopping (t') and exchange interactions (J') on pairing mode (s- or d-wave) and hole-binding, the t-t'-J-J' model has been considered within an 8-site square cluster (tilted). Using the Lanczos exact diagonalization method, the dominance of s-wave is identified. The formation of two-hole pair is observed at J'/t > 0.5. However, appearance of superconducting condensation is absent in the model.

Keywords

High-Tc superconductivity, T - t'- J - J' model, Hole pairing