<div dir="ltr"><div><div><div><div><div><div><div>Dear all,<br></div>Â Â Â Â Â Â Â Â Â Â Â Â Â I am trying to do a scf calculation considering spin-orbit interaction. Here is the input file:<br><br>&CONTROL<br>Â Â Â calculation = 'scf',<br>
   restart_mode='from_scratch',<br>   prefix='BiTe',<br>   pseudo_dir = './',<br>   outdir='./tempc',<br>   nstep = 500<br> /<br> &system<br>   ibrav= 0,<br>   nat= 40,<br>   ntyp= 2,<br>
   celldm(1) = 1.890359168,<br>   ecutwfc = 30.0,<br>   ecutrho= 300.0,<br>   occupations='smearing',<br>      degauss = 0.01 ,<br>    smearing = 'cold' ,<br>    starting_magnetization(1) = 0.5<br>    starting_magnetization(2) = 0.5<br>
          noncolin = .true.<br>            lspinorb = .true.<br>             <br>/<br> &ELECTRONS<br>             electron_maxstep = 500 ,<br>                conv_thr = 1.0d-10<br>                mixing_beta = 0.1 ,<br>
              mixing_mode = 'local-TF',<br>              mixing_ndim = 10 ,<br>/<br> &IONS<br>              upscale = 100 ,<br><br><br>/<br><br>CELL_PARAMETERS<br>8.7900000   0.00000000   0.00000000<br>-4.3950000  7.6123633   0.00000000<br>
0.00000000   0.00000000   36.64000000<br><br>ATOMIC_SPECIES<br>Te  127.6    Te.rel-pbe-dn-rrkjus_psl.0.2.2.UPF<br>Bi  208.980  Bi.pbe-d-mt.UPF<br><br>ATOMIC_POSITIONS angstrom<br>Te      0.001076915 -0.001111167 24.534365287<br>
Bi      0.000000000  0.000000000 12.190002400   0  0  0<br>Te      2.197500000  1.268727220 10.146666670   0  0  0<br>Te     -0.001767560  2.537644595 20.687693846<br>Te      0.000000000  0.000000000  6.383268000   0  0  0<br>
Te      2.197537577  1.265453382 16.833926576<br>Te     -0.000000000  2.537454430 13.910065330   0  0  0<br>----------------------------<br>K_POINTS automatic<br>4 4 1  0 0 0<br><br></div>Actually first I have relaxed the structure w/o considering spin-orbit interaction. Then I used the optimised coordinates to do the scf calculation but the system did not converge even after 300 cycles.<br>
<br></div>Thank you in advance<br><br></div>Regards<br></div>Pallavi Bothra<br></div>JNCASR, Bangalore<br></div>India<br><div><div><div><div><div><div><div><div><br></div></div></div></div></div></div></div></div></div>