I don't know what your question is, but hope that a comment might help.
Apparently you did not change size and shape of the unit cell (using a
1*1*1 supercell), so the lattice constants and angles are the same.
However, you told sgroup that there is not one type of Ni in the unit
cell but two. This change in the decoration of the bricks your crystal
is built of broke some symmetries in their arrangement - now you are
down to monoclinic.
I don't know exactly what af wave vector you want to establish in your
structure (+-+-, or ++--++--, or ... counting along which direction?).
Is your problem that your Ni1 and Ni2 are not the two you actually
wanted to have antiparallel moments?
If 'afIII' fits into this unit cell (Ni1 and Ni2 do have antiparallel
moments), and if the atoms are where you want them, run symmetry, set
spin directions in case.inst, run lstart ...
Type III sounds comlicated enough to not fit into this unit cell -
meaning that you cannot complete one period of the +/- count in your
chosen direction within the unit cell. In that case you have to change
shape and/or size of the unit cell. Maybe the options provided by
supercell (double the cell along basis directions ...) are sufficient.
There is no guarantee for this to be the case. You may have to work out
the fitting new shape and the positions of the atoms in the new unit
cell using additional tools.
I hope this helps,
Martin Pieper
---
Dr. Martin Pieper
Karl-Franzens University
Institute of Physics
Universitätsplatz 5
A-8010 Graz
Austria
Tel.: +43-(0)316-380-8564
Am 22.10.2017 20:57, schrieb Abderrahmane Reggad:
Dear wien users
I am studing the magnetic structure of type III for a orthorhombic
structure.
After doing the supercell and labelling the independent atoms for
spin-up and spin-dn atoms and using the sgroup command I got the
following structure:
The space group of a monoclinic structure and the lattice parameters
are those of orthorhombic structure.
NiS-MnP-afmIII
P LATTICE,NONEQUIV.ATOMS: 4 11_P21/m
MODE OF CALC=RELA unit=bohr
10.998349 10.005529 6.864228 90.00 90.00 90.00
ATOM -1: X=0.25021227 Y=0.1424 Z=0.2500
MULT= 2 ISPLIT= 8
-1: X=0.74978773 Y=0.8576 Z=0.7500
Ni1NPT= 781 R0=0.5000 RMT= 2.21Z: 28.0
LOCAL ROT MATRIX:1.000 0.000 0.000
0.000 1.000 0.000
0.000 0.000 1.000
ATOM -2: X=0.75024661 Y=0.50012576 Z=0.7500
MULT= 2 ISPLIT= 8
-2: X=0.24975339 Y=0.49987424 Z=0.2500
Ni2NPT= 781 R0=0.5000 RMT= 2.21Z: 28.0
LOCAL ROT MATRIX:1.000 0.000 0.000
0.000 1.000 0.000
0.000 0.000 1.000
ATOM -3: X=0.08986359 Y=0.75012482 Z=0.7500
MULT= 2 ISPLIT= 8
-3: X=0.91013641 Y=0.24987518 Z=0.2500
S 1NPT= 781 R0=0.0001 RMT= 1.81Z: 16.0
LOCAL ROT MATRIX:1.000 0.000 0.000
0.000 1.000 0.000
0.000 0.000 1.000
ATOM -4: X=0.41013993 Y=0.25012471 Z=0.7500
MULT= 2 ISPLIT= 8
-4: X=0.58986007 Y=0.74987529 Z=0.2500
S 2NPT= 781 R0=0.0001 RMT= 1.81Z: 16.0
LOCAL ROT MATRIX:1.000 0.000 0.000
0.000 1.000 0.000
0.000 0.000 1.000
4 NUMBER OF SYMMETRY OPERATIONS
Best regards
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