[Pw_forum] utilization of different Ultrasoft pseudopotentials
marcel at physik.tu-berlin.de
Fri Mar 27 15:17:57 CET 2009
On Fri, 27 Mar 2009, saqib.javaid at ipcms.u-strasbg.fr wrote:
> Dear PWSCF users,
> I have question regarding utilization of different type of Ultrasoft
> pseudopotentials. Is it correct to use different type of ultrasoft PS ( like
> rrkjus and Vanderbilt) for different atoms in a given system??? (e.g. one can
> use rrkjus PS of Cobalt and Vanderbilt PS of Mn with same XC functionals in a
> given system)
There is a similar question from beginning of this month, and the answer I
remember is yes, as long as they use the same XC functional (as you
However I got a question arising from this, too.
Why are rrkj pseudos sometimes called ultrasoft?
In the book by Richard
Martin the terms "ultra-soft" and "norm-conserving" are opposites, so only
Vanderbuilt pseudos or (PAW) are "ultrasoft".
However Troullier-Martins and rrkj are norm-conserving and thus I
conclude "not" ultrasoft ?!
I would greatly acknowledge any comment.
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