Dear All,<br>I am doing the SCF calculation for GaN using TM Pesudopotentials for Ga and N. But my SCF calculation is not converging. I have tried changing the "mixing-beta" parameter from 0.7 to 0.1.......still does not work. Any suggestions??? My SCF input file is as follows:-<br>
&control<br> calculation = 'scf'<br> restart_mode='from_scratch',<br> prefix='test',<br> tstress = .true.<br> tprnfor = .true.<br> pseudo_dir = '/home/samirmeher/espresso-4.0.5/pseudo/',<br>
outdir='/home/samirmeher/tmp/'<br> /<br> &system<br> ibrav= 4, celldm(1) =3.23, celldm(3) =5.2078, nat= 4, ntyp= 2,<br> ecutwfc = 50.0,<br> ecutrho = 300.0,<br> /<br> &electrons<br> diagonalization='cg'<br>
mixing_mode = 'plain'<br> mixing_beta = 0.6<br> conv_thr = 1.0d-8<br> /<br>ATOMIC_SPECIES<br> Ga 69.723 Ga.rel.TM.UPF<br> N 14.007 N.rel.TM.UPF<br>ATOMIC_POSITIONS<br> Ga 0.000000000 0.000000000 0.000000000 <br>
Ga 0.333000000 0.666000000 0.500000000 <br> N 0.000000000 0.000000000 0.375000000 <br> N 0.333000000 0.666000000 0.875000000<br>K_POINTS (automatic)<br> 6 6 6 0 0 0<br><br>Thanks in advance.<br>
Samir Ranjan Meher.<br>IIT Madras.<br>