Indentation size effect in Mg2C60 governed by depth-dependent activation of shear bands and localized amorphization
Indentation size effects in crystalline solids are commonly associated with dislocation-mediated strain gradients. Here, we show that the layered molecular crystal Mg2C60 exhibits a distinct small-scale response. Continuous stiffness nanoindentation reveals that both hardness and modulus increase as the indentation dep...