[Pw_forum] Surface Band structure calculation

[Victor Meng'wa]

Dear QE users,
i've done bands calculation,when i check my output on every kpoint there's
this message after computation,
that implies a significant number of eigenvalues in the c_bands  have not
converged.
 Computing kpt #:     9
     c_bands:  4 eigenvalues not converged
     total cpu time spent up to now is     6412.1 secs

     Computing kpt #:    10
     c_bands:  4 eigenvalues not converged
     total cpu time spent up to now is     7113.1 secs
this is almost repetitive almost for every kpoint
when i do the plotband.x ,i can't  get the bands since theres an error
message

Reading  72 bands at    73 k-points
Error reading k-point #    1
then it stops.
part of my input looks like:
&CONTROL
     restart_mode='from_scratch',
     calculation='bands',
     outdir='./',
     pseudo_dir='/home/mikeat/Applications/espresso-4.3.2/pseudo/',
     prefix = 'SnOru_exc1',
     tstress = .t.,
     tprnfor = .t.,
     etot_conv_thr = 1.d-5,
     forc_conv_thr = 1.d-4
     verbosity = 'high'


/
&SYSTEM
     ibrav=6,
     celldm(1)= 53.7129,
     celldm(3)=0.2242,
     nat=  53, ntyp= 2,
     nbnd=72,
     ecutwfc =30,ecutrho = 280,
     occupations='smearing', smearing='Gaussian', degauss=0.005
/
&ELECTRONS
      diagonalization = 'david'
      mixing_mode = 'local-TF',
      mixing_beta = 0.3,
      conv_thr = 1.0e-8,
/
ATOMIC_SPECIES
  Sn 50.011
Sn.pw91-n-van.UPF

   O 15.9994
O.pw91-van_ak.UPF

ATOMIC_POSITIONS
{bohr}

please i've been unable to i dentify why eigenvalues in the C_bands do not
converge and could this be reason why i get the error in
reading the k-points and how   can i correct this?
please assist

-- 
VICTOR KIRUI MENG'WA,
POST GRADUATE STUDENT,
CHEPKOILEL UNIVERSITY COLLEGE,
DEPARTMENT OF PHYSICS,
COMPUTATIONAL PHYSICS GROUP,
P.O BOX 1125,
ELDORET, KENYA
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