The Study Of Interplay Between Spin Density Wave And Superconductivity In Ferropnictides

This work focuses on the study of interplay between superconductivity and spin densityrnwave in Fe- based superconductors.The e ect of magnetic ordering state on transitionrntemperature(TC) has been investigated in Fe{based superconductors with in the BCSrntheory,irrespective of the pairing mechanism.rnThe expression for the transition temperatures(Tc and TSDW) as a function of superconductingrnorder parameter( S) and magnetic order parameter( SDW) has been obtainedrnusing the model Hamiltonian for the system and Green's function technique and their applicationrnhave been studied.And their values has been calculated numerically for suitablernvalues of system parameters.rnThe interplay of magnetic ordering state and superconductivity have been found crucialrnfor enhancing TC.It is also found that the presence of magnetic ordering state doesrnnot increase TC rather it decreases,but the suppression of this state should increase thernsuperconducting transition temperature(TC).rnOn the other hand,for suitable value of the parameters,we report the magnetic orderrndependent phase diagrams Which shows the interplay of superconductivity and spinrndensity wave in some Fe based superconductors.rnThe results are in general agreement with experimental observations and theoreticalrnmodels of ferropnictides

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