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

Pramana

N S Mondal1¹  N K Ghosh¹ 

[1] Department of Physics, University of Kalyani, Kalyani 741 235, India$$

关键词: High-𝑇c superconductivity;    t-J model;    𝑑-wave;    local singlet.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

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.

【 授权许可】

Unknown