I have calculated elastic constants for Si, GaAs, and GaN using LDA and GGA in VASP.
LDA is giving better results than GGA for elastic constants.
Is there is a reason behind the good results by LDA in this case. Is there any reference I can read to understand why this is so?
I also found some reviews on this but I am not able to understand the explanation.
Råsander, M., and M. A. Moram. "On the accuracy of commonly used density functional approximations in determining the elastic constants of insulators and semiconductors." The Journal of chemical physics 143.14 (2015): 144104.
Van de Walle, A., and G. Ceder. "Correcting overbinding in local-density-approximation calculations." Physical Review B 59.23 (1999): 14992.