  In this article, we analytically investigate the microstructure of a
five-dimensional neutral Gauss-Bonnet black hole, in the background of anti-de
Sitter spacetime, using scalar curvature of the Ruppeiner geometry constructed
via adiabatic compressibility. The microstructure details associated with the
small-large black hole phase transition are probed in the parameter space of
pressure and volume. The curvature scalar shows similar properties for both
phases of the black hole, it diverges in the vicinity of critical point and
approaches zero for extremal black holes. We show that the dominant interaction
among black hole molecules is attractive. This study also affirms that the
nature of the microstructure interaction remains unchanged during the
small-large black hole phase transition, even though the microstructures are
different for both phases.
