<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><br><br>--- On <b>Tue, 28/7/09, Neel Singh <i><neelphysics@yahoo.in></i></b> wrote:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><br><br><br><div id="yiv698307377"><table border="0" cellpadding="0" cellspacing="0"><tbody><tr><td style="font-family: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; font-size: inherit; line-height: inherit; font-size-adjust: inherit; font-stretch: inherit;" valign="top">Hi all,<br><br> I am new to PWSCF and trying to calculate Band structure of YVO4 but facing two problems ?<br><br>1.)No band is plotted in grpah above 0.0 value. The band structure is very large , as in the band Output file it is calculated like <br><br> End of band structure
calculation<br><br> k = 0.0000 0.0000 0.0000 band energies (ev):<br><br>-12.5188 -12.0378 -11.9977 -11.5969 -11.2203 -11.0959 -10.5816 -10.5411<br> -10.4664 -10.4588 -10.0894 -10.0558 -9.6071 -9.5783 -9.0182 -8.9833<br> 0.3058 0.6382 0.7747 0.9726 1.3117 1.4323 1.4740 1.5240<br>means band gap at gamma = 0.3058-(-8.9833)=
8.2891<br> which is very large ??<br><br>2) In the output of SCF and Bands , the output file has 4 warnings <br><br> warning: symmetry operation # 3 not allowed. fractional translation:<br> 0.0000000 -0.5000000 0.1164604 in crystal coordinates<br> warning: symmetry operation # 4 not allowed. fractional translation:<br> 0.0000000 0.0000000 0.1164604 in crystal coordinates<br> warning: symmetry operation # 25 not allowed. fractional translation:<br> 0.0000000 0.0000000 0.1164604 in crystal coordinates<br> warning: symmetry operation # 26 not allowed. fractional translation:<br> 0.0000000 -0.5000000 0..1164604 in
crystal coordinates<br><br>for this I have already increase the following quantities in the increments<br>kinetic-energy cutoff = 40.0000 Ry to 60<br> charge density cutoff = 250.0000 Ry to 400<br>But still the warnings are there.<br><br>Please help me. I will be very thankful. My Inputs for the calculations are following: <br><br>SCF INPUTS<br><br>&control<br> calculation='scf',<br> restart_mode='from_scratch',<br> prefix='yvo'<br> pseudo_dir = '/home/physics/pseudo/',<br> outdir='/home/physics/work/yvo/temp'<br> /<br> &system<br> ibrav =1, a=7.118300514, b= 7.118300514, c=6.289300454<br>, nat =24, ntyp= 3, ecutwfc = 40.0,ecutrho=250,<br> occupations='smearing',
smearing='mp', degauss=0.01, <br><br><br> /<br> &electrons<br> mixing_beta = 0.7<br> diagonalization = 'david'<br> conv_thr = 1.0e-4<br>/<br> &ions<br> /<br><br>ATOMIC_SPECIES<br> Y 88.90585 Y.pbe-nsp-van.UPF<br> V 50.9415 V.pbe-sp-van.UPF<br> O 15.9994 O.pbe-van_ak.UPF<br>ATOMIC_POSITIONS {angstrom}<br>Y 0.000000000 5.338725356 0.786162553<br>Y 3.559150238 1.779575118 3.930812762<br>Y 3.559150238
5.338725356 2.358487657<br>Y 0.000000000 1.779575118 5.503137866<br>V 0.000000000 1.779575118 2.358487657<br>V 3.559150238 5.338725356 5.503137866<br>V 0.000000000 5.338725356 3.930812762<br>V 3.559150238 1.779575118 0.786162553<br>O 0.000000000 3.090765987
1.262891534<br>O 3.559150238 6.649916224 4.407541744<br>O 3.559150238 4.027534488 4.407541744<br>O 0.000000000 0.468384251 1..262891534<br>O 5.807109607 5.338725356 2.835216639<br>O 4.870341106 1.779575118 5.979866849<br>O 3..559150238 3.090765987 1.881758675<br>O
0.000000000 6.649916224 5.026408885<br>O 0.000000000 4.027534488 5.026408885<br>O 3.559150238 0.468384251 1.881758675<br>O 4.870341106 5.338725356 0.30943357<br>O 5.807109607 1.779575118 3.45408378<br>O 1.311190868 1.779575118 3.45408378<br>O 2.247959369 5.338725356
0.30943357<br>O 2.247959369 1.779575118 5..979866849<br>O 1.311190868 5.338725356 2.835216639<br><br>K_POINTS {automatic}<br> 2 2 2 0 0 0<br><br>------------------------------------------------------------------------------------------------<br> BANDS INPUT<br>---------------------------------------------------------------------------------------------------<br><br>&control<br> calculation='bands'<br> pseudo_dir = '/home/physics/pseudo/',<br>
outdir='/home/physics/work/yvo/temp',<br> prefix='yvo',<br> <br> /<br> &system<br> ibrav =1, a=7.118300514, b= 7.118300514, c=6.289300454, nat=24, ntyp=3, <br>ecutwfc = 40.0,ecutrho=250, occupations='smearing', smearing='mp', degauss=0.01, nbnd= 98, <br> <br> /<br> &electrons<br> mixing_beta=0.7<br> conv_thr=1.0e-4<br> diagonalization = 'david'<br>/<br>&ions<br> /<br><br>ATOMIC_SPECIES<br> Y 88.90585 Y..pbe-nsp-van.UPF<br> V 50.9415 V.pbe-sp-van.UPF<br> O 15.9994 O.pbe-van_ak.UPF<br>ATOMIC_POSITIONS {angstrom}<br>Y 0.000000000 5.338725356
0.786162553<br>.<br>.<br>.<br>O ............ <br><br>K_POINTS<br> 26<br>0.000 0.000 0.000 1<br>0.000 0.000 0.125 1<br>0.000 0.000 0.250 1<br>0.000 0.000 0.375 1<br>0.000 0.000 0.500 1 <br>0.125 0.125 0.500 1 <br>0.250 0.250 0.500 1 <br>0.375 0.375 0.500
1 <br>0.500 0.500 0.500 1 <br>0.500 0.500 0.333 1 <br>0.500 0.500 0.166 1 <br>0.500 0.500 0.000 1 <br>0.375
0.375 0.000 1 <br>0.250 0.250 0.000 1 <br>0.125 0.125 0.000 1 <br>0.000 0.000 0.000 1 <br>0.000 0.000 0.166
1 <br>0.000 0.000 0.333 1 <br>0.000 0.166 0.500 1 <br>0.000 0.333 0.500 1 <br>0.000 0.500 0.500 1 <br>0.000 0.500 0.333
1 <br>0.000 0.500 0.166 1 <br>0.000 0.500 0.000 1 <br>0.000 0.333 0.000 1 <br>0.000 0.166 0.000 1
<br><br>---------------------------------------------------------------------------------------<br>-----------------------------------------------------------------------------<br><br>&inputpp<br> prefix = 'yvo'<br> outdir = '/home/physics/work/yvo/temp'<br> filband = 'yvobands.dat'<br>/<br><br>----------------------------------------------------------------------------------<br>-----------------------------------------------------------------------------------<br><br>yvobands.dat<br>-15 10<br>yvobands.xmgr<br>yvobands.ps<br>6.1088<br>1.0 6.1088<br><br>--------------------------------------------------------<br>-------------------------------------------------- please help . Thanks in Advance<br><br><br><br>With Regards.<br>Neel Singh <br>University of Delhi<br>India,<br><br><br></td></tr></tbody></table><br>
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