  Many theoretical models of iron-based superconductors have been proposed but
Tc calculations based on the models are usually missing. We have chosen two
models of iron-based superconductors in the literature and then compute the Tc
values accordingly: Recently two models have been announced which suggest that
superconducting electron concentration involved in the pairing mechanism of
iron-based superconductors may have been underestimated, and that the
antiferromagnetism and the induced xy potential may even have a dramatic
amplification effect on electron-phonon coupling. We use bulk FeSe, LiFeAs and
NaFeAs data to calculate the Tc based on these models and test if the combined
model can predict the superconducting transition temperature (Tc) of the
nanostructured FeSe monolayer well. To substantiate the recently announced xy
potential in the literature, we create a two-channel model to separately
superimpose the dynamics of the electron in the upper and lower tetrahedral
plane. The results of our two-channel model support the literature data. Our
computational model takes into account this amplifying effect of
antiferromagnetism and the correction of the electron-phonon scattering matrix
together with the abnormal soft out-of-plane lattice vibration of the layered
structure, which allows us to calculate theoretical Tc values of LiFeAs, NaFeAs
and FeSe as a function of pressure that correspond reasonably well to the
experimental values. More importantly, by taking into account the interfacial
effect between an FeSe monolayer and its SrTiO3 substrate as an additional gain
factor, our calculated Tc value is up to 91 K high, and provides evidence that
the strong Tc enhancement recently observed in such monolayers with Tc reaching
100 K may be contributed from the electrons within the ARPES range.
