SUPERCONDUCTIVITY AND MAGNETIC INTERACTION IN TWO BAND MODEL FOR HOLE- DOPED STRONTIUM IRON ARSENIDE S

ABSTRACT Superconductivity is characterized by disappearance of electrical resistivity and expulsion of magnetic field from the interior of a solid. The notion of interplay of magnetism and superconductivity has been an area of intensive research. In this work, the interaction between superconductivity and magnetism has been studied in strontium iron arsenide iron based superconductor, Sr1-xNaxFe2As2.Employing retarder double-time green function with two band model Hamiltonian, mathematical expression for superconducting transition temperature and spin density wave transition temperature as a function of order parameter have been found for SrFe2As2.The phase diagram of superconducting and magnetic temperature as a function of magnetic order parameter of Sr1-xNaxFe2As2,shows that the superconducting transition temperature decreases as the increase of the magnetic order parameter .The magnetic transition temperature increases with increase of the magnetic order parameter. The combined phase diagram of superconducting and magnetic temperature as a function of magnetic order parameter shows that superconducting and spin density wave (SDW) coexistence in some range of magnetic order parameter in SrFe2As2 which is in broad agreement with experiment observations.