  Understanding the microscopic behavior of the black holes ingredients has
been one of the important challenges in black holes physics during the past
decades. In order to shed some light on the microscopic structure of black
holes, in this paper, we explore a recently observed phenomenon for black holes
namely reentrant phase transition, by employing the Ruppeiner geometry.
Interestingly enough, we observe two properties for the phase behaviour of
small black holes that leads to reentrant phase transition. They are correlated
and they are of the interaction type. For the range of pressure in which the
system underlies reentrant phase transition, it transits from large black holes
phase to small one which possesses higher correlation than the other ranges of
pressures. On the other hand, the type of interaction between small black holes
near large/small transition line, differs for usual and reentrant phase
transitions. Indeed, for usual case, the dominant interaction is repulsive
whereas for reentrant case we encounter with an attractive interaction. We show
that in reentrant phase transition case, the small black holes behave like a
Bosonic gas whereas in the usual phase transition case, they behave like a
quantum anyon gas.
