  The last decades of high energy physics revealed, that in ultra-relativistic
ion-ion collisions, a strongly interacting quark gluon plasma (sQGP) is
created. Varying the collision energy allows for the investigation of the phase
diagram of QCD matter. The nature of the quark-hadron transition can be studied
via femtoscopy, as the investigation of momentum correlations in heavy ion
reactions reveals the space-time structure of the hadron production of the
sQGP. Going beyond the Gaussian assumption the shape of this source may be
described by L\'evy distributions. In this paper we report on recent
femtoscopic measurements of PHENIX, utilizing L\'evy sources.
