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[verstraete@pcpm.ucl.ac.be]

I can answer for the last question at least: an extra input file is added 
to anaddb for electron-phonon interactions. Just put a random file name 
stuff_GKK: as long as you don't set elphflag 1 in the input file, it won't 
be read, but a filename _must_ be entered in the anaddb files file.

If your acoustic modes are non-zero, something is not converged yet. The 
bad convergence is often associated to the pseudopotential (I already have 
a post or two on this - read the archive). If you try another the acoustic 
modes may be much better. Imposing the ASR may improve your piezoelectric 
constants too. The only systematic way to reduce the acoustic modes is 
increasing ecut. What are your stresses like? Choosing experimental 
lattice parameters and relaxing the ions is kind of a half-baked idea. 
Rigorously you should relax everything.


Matthieu


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Matthieu Verstraete               mailto:verstraete@pcpm.ucl.ac.be 
PCPM, Boltzmann, pl. Croix du Sud, 1        tel: +32 10 47 33 59
B-1348 Louvain-la-Neuve  Belgium            fax: +32 10 47 34 52