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

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    • 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


      N S Mondal1 N K Ghosh1

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

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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