[Pw_forum] Convergence of RS-GaAs

[naphtaly moro]

Dear All,
I am trying to do an SCF calculation on GaAs with a Rocksalt
structure. The calculations does not converge, I have tried to
increase the Ecut up to 200Ryd but still there's no convergence. I
have also attempted to increase the k-points with no success. What
might be the problem?
 My input is

 &control
    calculation = 'scf'
    restart_mode='from_scratch',
    prefix='GaAs',
    pseudo_dir='./'
    outdir = './',
 /
 &system
    ibrav=  2, celldm(1) =10.7, nat=  2, ntyp= 2,
    ecutwfc = 24, ecutrho = 100, nbnd = 8, nosym=.true.,
 /
 &electrons
    diagonalization='david'
    mixing_mode = 'plain'
    mixing_beta = 0.3
    conv_thr =  1.0d-8
    electron_maxstep=1000
 /
ATOMIC_SPECIES
 Ga  69.723  ga_ppot.gon
 As  74.9216 as_ppot.gon
ATOMIC_POSITIONS
 Ga 0.00 0.00 0.00
 As 0.50 0.50 0.50
K_POINTS {automatic}
 4 4 4 0 0 0

PS: I am using normconserving pseudos

-- 
Cecil Naphtaly Moro