J.C. Pelayo, D.M. Yanga
The Linked Cluster Theory in the spin polaron formulation is investigated in this paper using the finite temperature (Matsubara) Green's function method. We use a representation where holes and spins are described as spinless fermions and normal bosons, respectively. An analytic expression of the thermodynamic potential of higherature superconductors in the superconducting state was obtained using the Linked Cluster theory and an expression for its normal state by setting the energy gap to zero. The expression of the thermodynamic potential enabled us to calculate two bulk thermodynamic properties of higherature superconductors, entropy and specific heat, both in the normal and superconducting states. © 2019 World Scientific Publishing Company.
Department of Physics, University of San Carlos, Cebu City, 6000, Philippines
