• Bilayer exchange coupling and neel temperature of YBa2Cu3O6.2

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      https://www.ias.ac.in/article/fulltext/pram/054/03/0423-0429

    • Keywords

       

      Bilayer antiferromagnets; high-Tc superconductors; Neel temperature

    • Abstract

       

      The present paper attempts to study the Neel temperature of bilayer antiferromagnetic cuprate YBa2Cu3O6.2 within anisotropic Heisenberg model. The double time Green’s function formalism within random phase approximation (RPA) has been used to obtain various correlation functions. The magnetization and the Neel temperature (TN) are evaluated. It is observed that the ratio of intrabilayer to inplane exchange coupling (r=J⊥/J‖) plays an important role in the magnetic dynamics of bilayer systems. The recent experimental data of bilayer system YBa2Cu3O6.2 have been used to estimate the ratio r from the expression for Neel temperature. The estimated values of spin gap and the ratio of hopping matrix elements t⊥/t‖ are found to be in fairly good agreement with the existing experimental results.

    • Author Affiliations

       

      Govind1 A Pratap1 Ajay1 R S Tripathi1

      1. Department of Physics, G.B. Pant University of Agriculture and Technology, Pantnagar - 263 145, India
    • Dates

       
  • Pramana – Journal of Physics | News

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