• Effect of next-nearest-neighbour interaction on $d_{x^{2}−y^{2}}$ -wave superconducting phase in 2D t-J model

• # Fulltext

https://www.ias.ac.in/article/fulltext/pram/074/01/0115-0121

• # Keywords

High-$T_{c}$ superconductivity; t-J model; 𝑑-wave; local singlet.

• # Abstract

n exact diagonalization calculation of the t-J model on 2D square cluster has been studied for the ground state properties of HTSC. Effect of next-nearest-neighbour hopping and magnetic (both antiferromagnetic and ferromagnetic) interaction on $d_{x^{2} −y^{2}}$-wave pairing has been shown. Relative strength of the next-nearest-neighbour interaction with respect to that of near-neighbour interaction for the strongest $d_{x^{2} −y^{2}}$-wave pairing has been estimated. A schematic phase diagram is shown. It is shown that a two-sublattice model with antiferromagnetic interaction between them and a small intra-ferromagnetic-type interaction in one sublattice favours $d_{x^{2} −y^{2}}$-wave superconductivity and moderate negative type NNN hopping adds flavours to this phase.

• # Author Affiliations

1. Department of Physics, University of Kalyani, Kalyani 741 235, India

• # Pramana – Journal of Physics

Volume 94, 2020
All articles
Continuous Article Publishing mode

• # Editorial Note on Continuous Article Publication

Posted on July 25, 2019