Dear all,

I try to generate an Ultra Soft Pseudo Potential for W with no semi core and 6 
valence electrons.

As a first trial, I tried to generate NC PP and was not able to generate a PP 
without any ghost states. With L=1 as the local channel, I was able to generate 
only one ghost state, otherwise I've got two.

I then tried to generate US PP but was not able to avoid a ghost state for the 
L=0 channel with two projectors. I finally used a third projectors for L=0 and 
was eventually able to get rid of any ghost state as calculated with the option 
iswith=2.

My concern is about the logarithmic derivative which is not good and strongly 
deviates from the AE case. Based on the work of X.Gonze, PRB 8503, 1991, I can 
understand ghosts states for NC PP, but I am not real sure to fully understand 
in the case of US PP.

My question is : can I expect from the multi-projectors to  produce a "good" US 
PP even if the logarithmic derivative is not, or should I produce a well behave 
logarithmic derivative (if possible) before to go on in the validation of the 
US PP I produced against physical data.

Any other advice helping me cure this problem is welcome.

Many thanks for your answers,
Best regards,

___________________________

Yves Ferro
Aix-Marseille Universit?
France
yves.ferro at univ-amu.fr
___________________________

 











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