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Hi, I encountered a problem that the optimized lattice constant of SrO bulk is smaller than experimental value using GGA potential. I checked all Sr GGA potential (GGA and PAWGGA)in VASP potental database for this calculation, but the result is the same. Is it the problem from Sr GGA potential?

Thanks.

we are not aware of any problem with the Sr PP. Please check if you did the lattice constant optimization properly. (kpoint sets, precision, cutoffs, convergence parameters,....)