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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Hi Tayebeh<br>
<br>
I think all what you need to calculate a helix of magntic moments for Co ions in SrCO3 would be:<br>
<br>
1- Noncollinear calculations.<br>
2- A larger supercell to accommodate the helix.<br>
3- Fully relativistic pseudopotentials (such as those in Pslib)<br>
4- Define different Co species each with different direction for the magnetic moment<br>
5- You might also wish to use vc_relax rather than relax with cell_dofree to fix the volume but vary the shape of the cell. Or just vc_relax if you want to get a quick answer.<br>
<br>
<br>
I think all these ingredients are available and Pwscf is ready to tackle SrCO3 !<br>
<br>
<br>
Mostafa Youssef<br>
MIT <br>
<br>
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