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[effortbin@yahoo.com.cn]

Hello,
    I am trying to calculate the band structure, but I obtained some warning 
messages:
vtowfk: WARNING -   Wavefunctions not converged for nnsclo,ikpt=  200    1 
max resid=  1.69665E-11

scprqt:  WARNING -
  nstep=  200 was not enough non-SCF iterations to converge;
  maximum residual=  1.697E-11 exceeds tolwfr=  1.000E-18
I have checked documentation and FAQ for this problem, but I do not solve 
this problem yet. In addition I have done the convergence in ecut, I would 
like to know if can change the value of ecut when I am computing the band 
structure.
Here is my input files:
ndtset 2
kptopt1 1
nshiftk1 1
shiftk1 0.0 0.0 0.5
ngkpt1 4 4 4
prtden1 1
toldfe1 1.0d-10
iscf2 -2
getden2 -1
kptopt2 -8
nband2 50 #40
ndivk2 16 20 16 12 16 16 20                       #16 12 18 18 18 10
kptbounds2   0.0 0.0 0.0           #0.0 0.0  0.5   #0.5  0.25 0.75 #W
             0.0 0.0 0.5           #0.0 0.0  0.0   #0.5  0.0  0.0 # L point
            -0.333 0.667 0.5       #0.5 0.0  0.0
            -0.333 0.667 0.0       #0.5 0.25 0.75   #0.0  0.0  0.0 # Gamma 
point
             0.0 0.0 0.0           #0.5 0.5  0.0   #0.0  0.5  0.5 # X point
             0.0 0.5 0.0           #0.5 0.5  0.5   #0.5  0.25 0.75 #W
             0.0 0.5 0.5           #0.0 0.0  0.0   #0.0  0.0  0.0 # Gamma 
point in another cell.
            -0.333 0.667 0.5
tolwfr2 1.0d-18
enunit2 1
prteig2 1
ecut 36.0
pawecutdg 52.0
acell 14.440 14.440 8.393
angdeg 90.000 90.000 120.000
znucl 57 17
natom 8
ntypat 2
typat 1 1 2 2 2 2 2 2
xred  1/3  2/3  1/4
     -1/3 -2/3 -1/4
      0.39104   0.30586  0.25
     -0.39104  -0.30586 -0.25
     -0.30586   0.08518  0.25
      0.30586  -0.08518 -0.25
     -0.08518  -0.39104  0.25
      0.08518   0.39104 -0.25
nstep 300
diemac 2.0
Your kind help and suggestions are greatly appreciated!
bin