Re: [SIESTA-L] Treating of charged defects and pseudopotentials for ions

2005-05-09 Thread Paulo Cesar Piquini
Dear All, As far as I know, a good reference for this discussion is the article of Makov and Payne, Physical Review B 51, 4014 (1995). Paulo Piquini 2005/5/8, Andrei Postnikov <[EMAIL PROTECTED]>: > Many thanks to Riccardo Rurali and Emilio Artacho > for their enlightening remarks about calculat

Re: [SIESTA-L] Treating of charged defects and pseudopotentials for ions

2005-05-08 Thread Andrei Postnikov
Many thanks to Riccardo Rurali and Emilio Artacho for their enlightening remarks about calculations with net charge! Now that this topic is under discussion, I wonder (if anybody has experience) whether we should check the convergency vs. cell size only when comparing DIFFERENTLY charged systems,

Re: [SIESTA-L] Treating of charged defects and pseudopotentials for ions

2005-05-07 Thread Riccardo Rurali
Dear all, just a few minor remarks about the on-going discussion on charged systems. > Then comes the charge of system. Whatever is provided in SIESTA is only > for treating charged molecules or clusters, and don't be confused > by the reference to SC, BCC and FCC in the corresponding section of

Re: [SIESTA-L] Treating of charged defects and pseudopotentials for ions

2005-05-06 Thread Andrei Postnikov
Hallo Konstantin, I think you mix up several things. The choice of pseudopot is one thing and a treatment of charged system is another. The pseudopot has nothing, or in a very indirect way if at all, to do with whether your system will be charged or not. In ideal case, the pseudopot is supposed to

[SIESTA-L] Treating of charged defects and pseudopotentials for ions

2005-05-06 Thread Konstantin Rushchanskii
Dear SIESTA users, I'm trying to investigate the influence of charged defects on structural and electronic properties of some ferroelectric crystals. For this purpose I need to construct a pseudopotential for the Ni +2 ion. But I'm not sure in the way of choosing the valence and core states of th