Specific Heat Study in Iron Based Superconductors: A Theoretical Three-Orbital Model Analysis.

The present work deals with the study of specific heat in superconducting state of iron based superconductors. In these materials, five 3d orbitals due to iron, Hund's coupling and electron correlations coexist and dominate electronic properties of these systems. Therefore, we have attempted the theoretical analysis based on three orbitals per site tight-binding model Hamiltonian containing hopping between orbitals, Hund's coupling and intra and inter orbital Coulomb interaction. We have employed Green's function technique within BCS mean field approximation to calculate the expresssions of superconducting energy gap parameter and quasiparticle energies and used these results to calculate specific heat jump as a function of temperature and various parameters of the model Hamoiltonian. Then we compared the results with the recent specific heat data and other relevant data of iron based superconductors.
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