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'''A:''' Yes, you can (if implemented, of course: a few calculations
are not available with USPP, a few more are not for PAW). A small
restrictions exists in cp.x, expecting atoms with USPP listed before
those with NCPP, which in turn are expected before local PP's (if any).
Otherwise you can mix and match, as long as the XC functional used in
the generation of the PP is the same for all PP's. Note that
it is the hardest atom that determines the cutoff.
'''A:''' See the wiki page on [[Pseudopotentials]], follow those
links. New contributions to the PP table are appreciated.
If X is one of the rare earths: please consider first if DFT is
suitable for your system!
Paolo Giannozzi
2009-10-01