The Study of Interplay between Spin Density Wave and Superconductivity in Ferropnictides
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Date
2011-06
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Addis Ababa University
Abstract
This work focuses on the study of interplay between superconductivity and spin density
wave in Fe- based superconductors.The e ect of magnetic ordering state on transition
temperature(TC) has been investigated in Fe{based superconductors with in the BCS
theory,irrespective of the pairing mechanism.
The expression for the transition temperatures(Tc and TSDW) as a function of superconducting
order parameter( S) and magnetic order parameter( SDW) has been obtained
using the model Hamiltonian for the system and Green's function technique and their application
have been studied.And their values has been calculated numerically for suitable
values of system parameters.
The interplay of magnetic ordering state and superconductivity have been found crucial
for enhancing TC.It is also found that the presence of magnetic ordering state does
not increase TC rather it decreases,but the suppression of this state should increase the
superconducting transition temperature(TC).
On the other hand,for suitable value of the parameters,we report the magnetic order
dependent phase diagrams Which shows the interplay of superconductivity and spin
density wave in some Fe based superconductors.
The results are in general agreement with experimental observations and theoretical
models of ferropnictides
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Superconductivity in Ferropnictides