Hello,<br> Thank you Professor Blaha and Faccio for your messages. About the crystal structure, I am using a supercell comprised of 10 unit cells in the z direction, with 6 atoms per unit cell, so there are 60 atoms. In otherewords, it's 60 layers instead of 10. The first few entries generated by supercell is given by:
<br><br><i>H LATTICE,NONEQUIV. ATOMS 10 <br>MODE OF CALC=RELA unit=bohr<br> 8.569908 8.569908227.252250 90.000000 90.000000120.000000<br>ATOM 1: X=0.00000000 Y=0.00000000 Z=0.07525172<br> MULT= 6 ISPLIT=15
<br>ATOM 1: X=0.00000000 Y=0.00000000 Z=0.02298812<br>ATOM 1: X=0.66666667 Y=0.33333333 Z=0.00975849<br>ATOM 1: X=0.66666667 Y=0.33333333 Z=0.05573474<br>ATOM 1: X=0.33333333 Y=0.66666667 Z=0.04250511<br>ATOM 1: X=
0.33333333 Y=0.66666667 Z=0.08848135<br>Bi NPT= 781 R0=0.00000500 RMT= 2.0000 Z: 83.0<br>LOCAL ROT MATRIX: 1.0000000 0.0000000 0.0000000<br> 0.0000000 1.0000000 0.0000000<br>
0.0000000 0.0000000 1.0000000<br><br></i><div style="text-align: left;">After running symmetry, I adopted the struct generated by the file, given by:<br></div><i>H LATTICE,NONEQUIV.ATOMS: 60 156 P3m1
<br> RELA <br> 8.569908 8.569908227.252250 90.000000 90.000000120.000000 <br>ATOM -1: X=0.00000000 Y=0.00000000 Z=0.00000000<br>
MULT= 1 ISPLIT= 4<br>Bi1 NPT= 781 R0=0.00000500 RMT= 2.5000 Z: 83.0 <br>LOCAL ROT MATRIX: 1.0000000 0.0000000 0.0000000<br> 0.0000000 1.0000000 0.0000000
<br> 0.0000000 0.0000000 1.0000000<br>ATOM -2: X=0.00000000 Y=0.00000000 Z=0.94773640<br> MULT= 1 ISPLIT= 4<br>Bi2 NPT= 781 R0=0.00000500 RMT= 2.5000 Z: 83.0
<br>LOCAL ROT MATRIX: 1.0000000 0.0000000 0.0000000<br> 0.0000000 1.0000000 0.0000000<br> 0.0000000 0.0000000 1.0000000<br></i>So the number of inequivalent atoms has been increased by symmetry. Should I not accept the struct file generated by it? Also, as a side question along the same vein, for the surface bands is 1x1 unit cell in the x-y direction sufficient? Ans is the 5x5x1 k-mesh sufficient for that purpose? I used 2x2x10 before but I am trying to minimize the number of unit cells used to save calculation time.
<br><br>The calculation doesn't seem to be converging,<br>DIS : CHARGE DISTANCE ( 0.1641572 for atom 37 spin 1) 0.1545264<br>DIS : CHARGE DISTANCE ( 0.1913422 for atom 3 spin 1) 0.1529912
<br>...<br>DIS : CHARGE DISTANCE ( 1.1335284 for atom 51 spin 1) 0.5305745<br>DIS : CHARGE DISTANCE ( 1.1275002 for atom 18 spin 1) 0.6506100<br>...<br>DIS : CHARGE DISTANCE ( 0.3828902
for atom 49 spin 1) 0.1680688<br>DIS : CHARGE DISTANCE ( 0.4418754 for atom 46 spin 1) 0.2222958<br>DIS : CHARGE DISTANCE ( 0.4079805 for atom 47 spin 1) 0.2201738<br><br>I will try to run a calculation without -scf. I did not do so before because each calculation takes at least 2 weeks, and the system is unphysical without spin-orbit coupling. Could you please explain why the calculation is not converging?
<br><br>Thank you.<br>Sincerely yours,<br>Matthew Xia<br><br><div class="gmail_quote">On Dec 10, 2007 2:03 AM, Peter Blaha <<a href="mailto:pblaha@theochem.tuwien.ac.at">pblaha@theochem.tuwien.ac.at</a>> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
First of all, please check your convergence (grep :DIS case.scf)<br>Is it converging or diverging ?<br><br>Second: I'm not sure if it matters, but remove the line<br><div class="Ih2E3d"> > 0 -4.97 0.005 atom number,e-lo,de (
case.in1), repeat NX<br></div>from your inso file (You specified correctly "0" RLOs, so this line<br>should not be there).<br><br>Did you run without -so before ? Usually this should be the first step.<br><br>Your error ocured for atom 44 ? Why do you have all 60 atoms
<br>non-equivalent ? I'd expect some symmetry ?<br>Ad I do not understand either why a 10 layer cell has 60 atoms ?<br><br><br>Matthew Xia schrieb:<br><div><div></div><div class="Wj3C7c">> Hello Wien Users,<br>> Many thanks first to the forum for providing guidance to the wien
<br>> package. I am interested in calculating the surface state of Bi, using a<br>> 1x1x10 supercell (10 bilayers) with a 5x5x1 k-mesh. After initializing<br>> the calculation and accepting the geometry offered by nn, I ran the scf
<br>> with spin orbit coupling. The calculation ran for 21 iterations, until<br>> at the end of the 22nd the calculation stopped:<br>> / cycle 22 (Fri Dec 7 14:45:49 EST 2007) (19/19 to go)<br>><br>> > lapw0 (14:45:49)
228.126u 1.693s 3:56.95 96.9% 0+0k 0+0io 24pf+0w<br>> > lapw1 -c (14:49:47) 9935.601u 146.192s 7:40:52.37 36.4% 0+0k<br>> 0+0io 640167pf+0w<br>> > lapwso -c (22:30:44) 2084.313u 31.731s 1:26:14.72
40.8% 0+0k 0+0io<br>> 117209pf+0w<br>> > lapw2 -c -so (23:57:03) 1310.015u 166.919s 31:28.94 78.1% 0+0k<br>> 0+0io 4578pf+0w<br>><br>> > stop error<br>> /<br>> Tha lapw2.error reads:/ 'l2main' -
QTL-B.GT.15., Ghostbands, check scf<br>> files/<br>><br>> and the end of scf2 file reads: /QTL-B VALUE .EQ. ********** in<br>> Band of energy -4.74977 ATOM= 44 L= 0<br>> Check for ghostbands or EIGENVALUES BELOW XX messages
<br>> Adjust your Energy-parameters or use -in1new switch, check RMTs !!!<br>> :WARN : QTL-B value eq.******* in Band of energy -4.74977 ATOM=<br>> 44 L= 0<br>> :WARN : You should change the E-parameter in
case.in1 or use -in1new switch<br>><br>> /I have used the same RMT values and energy-parameters before to do<br>> bulk calculations with the Bi unit cell, and that calculation has ran<br>> well without any problems. My in1 file reads:
<br>> /WFFIL (WFPRI, SUPWF)<br>> 7.00 10 4 (R-MT*K-MAX; MAX L IN WF, V-NMT<br>> 0.30 5 0 (GLOBAL E-PARAMETER WITH n OTHER CHOICES, global<br>> APW/LAPW)<br>> 2 -1.54 0.010
CONT...<br>> 0.000 CONT 1<br>> K-VECTORS FROM UNIT:4 -9.0 3.0 519 emin/emax/nband #red<br>> /And my inso file reads:<br>> /WFFIL<br>> 4 1 0 llmax,ipr,kpot<br>> -10.0000
1.50000 emin,emax (output energy window)<br>> 1. 1. 1. direction of magnetization (lattice vectors)<br>> 0 number of atoms for which RLO is added<br>> 0 -
4.97 0.005 atom number,e-lo,de (case.in1), repeat NX times<br>> 0 0 0 0 0 number of atoms for which SO is switch<br>> off; atoms<br>><br>> /The SCF file reads, for the last iteration as:
<br>> ---------<br>> /:ITE001: 1. ITERATION<br>><br>> :NATO : 60 INDEPENDEND AND 60 TOTAL ATOMS IN UNITCELL<br>> LATTICE = H<br>> :POT : POTENTIAL OPTION 13<br>
> :LAT : LATTICE CONSTANTS= 8.56991 8.56991227.25225<br>> :VOL : UNIT CELL VOLUME = 14454.10292<br>> MODE OF CALCULATION IS = RELA<br>> NON-SPINPOLARIZED CALCULATION<br>> :IFFT : FFT-parameters: 36 36 900 Factor:
1.00<br>> ATOMNUMBER= 1 Bi1 VCOUL-ZERO = 0.21765E+00<br>> :EFG001: EFG = -0.00400 *10**21 V /<br>> m**2<br>><br>> OVERALL ENERGY PARAMETER IS 0.3000<br>
> OVERALL BASIS SET ON ATOM IS LAPW<br>> E( 2)= -1.2200 E(BOTTOM)= -1.400 E(TOP)= -1.040<br>> APW+lo<br>> E( 2)= 0.3000<br>> LOCAL ORBITAL
<br>> E( 0)= -0.7300 E(BOTTOM)= -1.090 E(TOP)= -200.000<br>> APW+lo<br>> E( 0)= 0.3000<br>> LOCAL ORBITAL<br>> E( 1)= 0.3000<br>> APW+lo
<br>><br>> K= 0.00000 0.00000 0.00000 1<br>> :RKM : MATRIX SIZE 6227LOs: 900 RKM= 6.98 WEIGHT= 1.00 PGR:<br>> EIGENVALUES ARE:<br>> -1.3853569 -1.3853569 -1.3817454
-1.3817454 -1.3808292<br>> - 1.3808292 -1.3783348 -1.3783348 -1.3762158 -1.3762158<br>> -1.3741646 -1.3741646 -1.3729990 -1.3707902 ....<br>><br>> /Could someone please suggest where the problem might be? Any guidance
<br>> will be much appreciated.<br>><br>> Thank you.<br>> MX<br>><br>><br></div></div>> ------------------------------------------------------------------------<br><div><div></div><div class="Wj3C7c">
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