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Suspensions of hard colloidal particles frequently serve as model systems instudies on fundamental aspects of phase transitions. But often colloidalparticles that are considered as ``hard'' are in fact weakly charged. If thecolloids are spherical, weak charging has a only a weak effect on thestructural properties of the suspension, which can be easily corrected for.However, this does not hold for anisotropic particles.  We introduce a model for the interaction potential between charged ellipsoidsof revolution (spheroids) based on the Derjaguin approximation ofDebye--H\"uckel Theory and present a computer simulation study on aspects ofthe system's structural properties and phase behaviour. In line with previousexperimental observations, we find that even a weak surface charge has a strongimpact on the correlation functions. A likewise strong impact is seen on thephase behaviour, in particular, we find stable cubatic order in suspensions ofoblate ellipsoids.

Strong Effect of Weak Charging in Suspensions of Anisotropic Colloids