• Self-consistent numerical study of pure and impurity doped three-band Hubbard model

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      https://www.ias.ac.in/article/fulltext/pram/049/05/0505-0514

    • Keywords

       

      Three-band Hubbard model; charge-transfer insulator; Mott-Hubbard insulator; highTc superconductor; impurity

    • Abstract

       

      The three-band Hubbard model — both pure and with static non-magnetic impurities — has been studied within a self-consistent numerical Hartree-Fock (HF) scheme. The system shows nesting properties only in the absence of direct O-O hopping. Spin excitations in the system are gapless with the existence of a Goldstone mode in the broken-symmetry state. The variation of spinwave velocity with Cu-site Coulomb repulsion shows a (1/(2Ud)+(1/Δ)) dependence in the strong-coupling limit. Each non-magnetic impurity in the system gives rise to two gap states for a particular spin and the local moment produced is robust even at finite concentration of mobile hole doping. The gapless Goldstone mode is preserved even in case of unequal concentration of impurities on the two sublattices.

    • Author Affiliations

       

      Prasenjit Sen1 Avinash Singh1

      1. Department of Physics, Indian Institute of Technology, Kanpur - 208 016, India
    • Dates

       
  • Pramana – Journal of Physics | News

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