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In recent work we revisited the phase diagram of hard ellipsoids ofrevolution (spheroids) by means of replica exchange Monte Carlo simulations.This was done by setting random initial configurations, and allows to confirmthe formation of sm2 crystal structures at high densities [Phys. Rev. E 75,020402 (2007)] for large anisotropies and stretched-fcc for small anisotropies.In this work we employed the same technique but setting the starting cells assm2 crystal structures having the maximum known packing density [Phys. Rev.Lett. 92, 255506 (2004)]. This procedure yields a very rich behavior forquasi-spherical oblates and prolates. These systems, from low to highpressures, show the following phases: isotropic fluid, plastic solid,stretched-fcc solid, and sm2 solid. The first three transitions are firstorder, whereas the last one is a subtle, probably high order transition. Thispicture is consistent with the fact of having the sm2 structure capable ofproducing the maximally achievable density.

Further details on the phase diagram of hard ellipsoids of revolution