# Example: Spin-Orbit unrestricted non-collinear: Tl¶

Download Tl_noncollinear.run

Application of the Spin-Orbit relativistic option (using double-group symmetry, in this case NOSYM) to Tl using the collinear and non-collinear approximation for unrestricted Spin-Orbit calculations

Note: For the collinear and the non-collinear approximation one should use symmetry NOSYM and use the key UNRESTRICTED.

The non-collinear example:

\$ADFBIN/adf  << eor
Title Tl spinorbit noncollinear
Atoms
Tl 0 0 0
End
Relativistic  Spinorbit ZORA
XC
end
symmetry nosym
unrestricted
noncollinear
Fragments
Tl t21.Tl
End
BeckeGrid
quality good
End
End input
eor


If one replaces the key NONCOLLINEAR with COLLINEAR the collinear approximation will be used instead of the non-collinear approximation. In the case of the collinear approximation default the direction of the magnetization is in the direction of the z-axis. In the non-collinear approximation the magnetization can differ in each point in space.