Crystal Structure of Rb4C60 and K4C60 under Pressure
Ashfia Huq, Peter W. Stephens
Abstract
We show that Rb4C60 transforms from its ambient pressure orientationally disordered tetragonal structure to an ordered orthorhombic structure (isostructural to Cs4C60) at or above 0.4 GPa. This opens the possibility of studying the previously observed metal-insulator transition under pressure in this narrow band system as a function of a continuous variable, rather than formulating distinct models for conducting and insulating fullerides. No such transition is observed in K4C60 to 2.0 GPa
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