Dear Ahmad,<div><br></div><div>The option nbnd is related to the number of electrons that you have in your system.</div><div>You may increase this number without increase the number of k-points.</div><div>Usually you should request nbnd equal the number of valence electrons divided by 2 (plus more bands if you want unoccupied states, I would suggest add +4 bands at least).</div>
<div><br></div><div>Best regards, </div><div><br></div><div>-- <br>_________________________________________<br>Filipe Camargo Dalmatti Alves Lima<br>PhD Student<br>University of São Paulo, Physics Institute, Materials Physics Department, Nanomol Group, Brazil.<br>
Phones: (11) 3091-6881 (USP)<br> (11) 8249-4628 (TIM)</div><div><br></div><div><br><br><div class="gmail_quote">On Wed, Jul 18, 2012 at 11:41 AM, Sohail Ahmad <span dir="ltr"><<a href="mailto:sohailphysics@yahoo.co.in" target="_blank">sohailphysics@yahoo.co.in</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><table cellspacing="0" cellpadding="0" border="0"><tbody><tr><td valign="top" style="font:inherit">Dear Users<br><br>I run scf and nscf and calculated band structure and DOS succesfully for Molybdenum Disulphide (valence electron =36) in a 4x4x4 with nbnd =20<br>
but the problem in band structure i couldnot see sufficient no. of bands<br><br>Then i tried to repeat the same in 12x12x12 with nbnd=30 but the program failed to run<br><br>Should i try for lesser mesh for scf and do bigger mesh for nscf ????<br>
<br>&control<br> calculation = 'scf',<br> restart_mode = 'from_scratch',<br> prefix = 'MoSb1',<br> pseudo_dir = '/home/sandeep/espresso-4.2.1/pseudo',<br> outdir = './OUT',<br>
/<br> &system<br> ibrav = 4, celldm(1) = 6.0281946, celldm(3) = 3.89, nat = 6, ntyp = 2,<br> ecutwfc = 70,<br> ecutrho = 300,<br> nbnd = 30,<br> occupations = 'smearing', smearing = 'gaussian',
degauss = 0.001,<br> nspin = 2,<br> starting_magnetization(1) = 0.1d0,<br> /<br> &electrons<br> mixing_beta = 0.3,<br> conv_thr = 1.0d-9,<br> /<br>ATOMIC_SPECIES<br>Mo 95.96 Mo.pw91-n-van.UPF<br>S 32.06 S.pw91-van_ak.UPF<br>
ATOMIC_POSITIONS {crystal}<br>Mo 0.33333333 0.66666667 0.25000000<br>Mo 0.66666667 0.33333333 0.75000000<br>S 0.33333333 0.66666667 0.62000000<br>S 0.66666667 0.33333333 0.12000000<br>S 0.66666667 0.33333333 -0.62000000<br>
S 0.33333333 0.66666667 -0.12000000<br>K_POINTS AUTOMATIC<br>12 12 12 1 1 1<br><br><br></td></tr></tbody></table><br>_______________________________________________<br>
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