Dear WIEN users,<br> I need the help of an expert on <br> surface calculations with WIEN2k.<br> I built a three-layer Cu(111) slab with <br> vacuum corresponding to 7 layers. <br> Each layer contains 4 copper atoms. <br> I put cobalt at a site with fcc symmetry on <br> one side.<br> Below are the steps that I went through:<br> <br> bulk lattice constant = 6.71 bohr<br> NN distance = 4.7447<br> Interlayer spacing = 3.874 bohr<br> a = b = 2*4.7447 = 9.489 c=9*3.874=34.866 bohr<br> alpha=beta=90 gamma=120<br> <br> Cu1:(0,0,0)<br> Cu2:(1/2,0,0)<br> Cu3:(0,1/2,0)<br> Cu4:(1/2,1/2,0)<br> <br> Cu5:(1/3,1/6,1/9)<br> Cu6:(5/6,1/6,1/9)<br> Cu7:(1/3,2/3,1/9)<br> Cu8:(5/6,2/3,1/9)<br> <br> Cu9:(1/3,1/6,2/9)<br> Cu10:(5/6,1/6,2/9)<br> Cu11:(1/3,2/3,2/9)<br> Cu12:(5/6,2/3,2/9)<br> <br> Co1:(0,0,3.5/9)<br> <br> But case.struct gives me only 1 symmetry <br> operation. I want to place another cobalt <br> atom on the other side of the slab <br> to get inversion symmetry
to speed <br> up the calculations. How do I do that?<br> <br> Thank you<br> <br> J. Appleton<br> <br> ================================================<br> cu111<br> P LATTICE,NONEQUIV.ATOMS: 13<br> MODE OF CALC=RELA unit=bohr<br> 9.489000 9.489000 34.866000 90.000000 90.000000120.000000<br> ATOM -1: X=0.00000000 Y=0.00000000 Z=0.00000000<br> MULT= 1 ISPLIT= 8<br> Cu1 NPT= 781 R0=0.00010000 RMT= 2.2000 Z: 29.0<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=0.50000000 Y=0.00000000 Z=0.00000000<br> MULT= 1 ISPLIT= 8<br> Cu2 NPT= 781 R0=0.00010000 RMT= 2.2000 Z: 29.0<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 -3: X=0.00000000 Y=0.50000000 Z=0.00000000<br> MULT= 1 ISPLIT= 8<br> Cu3 NPT=
781 R0=0.00010000 RMT= 2.2000 Z: 29.0<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 -4: X=0.50000000 Y=0.50000000 Z=0.00000000<br> MULT= 1 ISPLIT= 8<br> Cu4 NPT= 781 R0=0.00010000 RMT= 2.2000 Z: 29.0<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 -5: X=0.33333333 Y=0.16666667 Z=0.11111111<br> MULT= 1 ISPLIT= 8<br> Cu5 NPT= 781 R0=0.00010000 RMT= 2.2000 Z: 29.0<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 -6: X=0.83333333 Y=0.16666667 Z=0.11111111<br>
MULT= 1 ISPLIT= 8<br> Cu6 NPT= 781 R0=0.00010000 RMT= 2.2000 Z: 29.0<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 -7: X=0.33333333 Y=0.66666666 Z=0.11111111<br> MULT= 1 ISPLIT= 8<br> Cu7 NPT= 781 R0=0.00010000 RMT= 2.2000 Z: 29.0<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 -8: X=0.83333333 Y=0.66666667 Z=0.11111111<br> MULT= 1 ISPLIT= 8<br> Cu8 NPT= 781 R0=0.00010000 RMT= 2.2000 Z: 29.0<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 -9: X=0.16666667 Y=0.33333333 Z=0.22222222<br> MULT= 1 ISPLIT= 8<br> Cu9 NPT= 781 R0=0.00010000 RMT= 2.2000 Z: 29.0<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 -10: X=0.66666667 Y=0.33333333 Z=0.22222222<br> MULT=
1 ISPLIT= 8<br> Cu10 NPT= 781 R0=0.00010000 RMT= 2.2000 Z: 29.0<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 -11: X=0.16666667 Y=0.83333333 Z=0.22222222<br> MULT= 1 ISPLIT= 8<br> Cu11 NPT= 781 R0=0.00010000 RMT= 2.2000 Z: 29.0<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 -12: X=0.66666667 Y=0.83333333 Z=0.22222222<br> MULT= 1 ISPLIT= 8<br> Cu12 NPT= 781 R0=0.00010000 RMT= 2.2000 Z: 29.0<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 -13: X=0.00000000 Y=0.00000000 Z=0.38888889<br> MULT= 1 ISPLIT= 8<br> Co13 NPT= 781 R0=0.00010000 RMT= 2.1500 Z: 27.0<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> 1 NUMBER OF SYMMETRY OPERATIONS<br> 1 0 0 0.0000000<br> 0 1 0 0.0000000<br> 0 0 1 0.0000000<br> 1<br> <br> <br> <br>