Available pseudopotentials:
Perdew-Wang 91 gradient-corrected functional nonlinear core-correction Vanderbilt ultrasoft
Perdew-Burke-Ernzerhof (PBE) exch-corr Martins-Troullier author: EM
Perdew-Burke-Ernzerhof (PBE) exch-corr nonlinear core-correction Vanderbilt ultrasoft