Bulk FeSe superconducts inside a nematic phase, that sets in through an
orthorhombic distortion of the high temperature tetragonal phase. Bulk
non-alloy tetragonal superconducting FeSe does not exist as yet. This raises
the question whether nematicity is fundamental to superconductivity. We employ
an advanced ab-initio ability and show that bulk tetragonal FeSe can, in
principle, superconduct at almost the same Tc as the orthorhombic phase had
that been the ground state. Further, we perform rigorous benchmarking of our
theoretical spin susceptibilities against experimentally observed data over all
energies and relevant momentum direction. We show that susceptibilities
computed in both the tetragonal and orthorhombic phases already have the
correct momentum structure at all energies, but not the desired intensity. The
enhanced nematicity that simulates the correct spin fluctuation intensity can
only lead to a maximum 10-15% increment in the superconducting Tc . Our results
suggest while nematicity may be intrinsic property of the bulk FeSe, is not the
primary force driving the superconducting pairing.Comment: 5 page, 4 figure