<div dir="ltr"><div>I am attempting to carry out a calculation for ferromagnetic bcc Fe using CP2K 6.1. Attached are the input and output files.</div><div><br></div><div>The calculation runs to completion, but I am confused by the output. The multiplicity is not 1</div><div><br></div><div> <span style="font-family: courier new, monospace;">Orbital energies State    Spin L    Occupation  Energy[a.u.]   Energy[eV]<br><br>                      1   alpha 0         1.000     -3.533760   -96.158487<br>                      2   alpha 0         1.000     -0.171394    -4.663878<br>                      1    beta 0         1.000     -3.422092   -93.119858<br>                      2    beta 0         1.000     -0.151638    -4.126285<br><br>                      1   alpha 1         3.000     -2.201116   -59.895424<br>                      1    beta 1         3.000     -2.092954   -56.952177<br><br>                      1   alpha 2         4.250     -0.282066    -7.675405<br>                      1    beta 2         1.750     -0.191730    -5.217225<br></span><br></div><div>yet the system appears to have zero spin moment:<br></div><div><br></div><div><span style="font-family: courier new, monospace;"> !-----------------------------------------------------------------------------!<br>                    Mulliken Population Analysis<br><br> # Atom Element Kind Atomic population (alpha,beta) Net charge Spin moment<br>      1    Fe      1        8.000000    8.000000    0.000000    0.000000<br>      2    Fe      1        8.000000    8.000000    0.000000   -0.000000<br> # Total charge and spin      16.000000   16.000000    0.000000   -0.000000<br><br> !-----------------------------------------------------------------------------!</span><br></div><div><br></div><div>Between these blocks of output seems to be a rescaling step which might explain the discrepancy:<br></div><div><br></div><div><span style="font-family: courier new, monospace;">Spin 1<br> Re-scaling the density matrix to get the right number of electrons for spin 1<br>                 # Electrons             Trace(P)              Scaling factor<br>                          16               18.500                       0.865<br><br> Spin 2<br> Re-scaling the density matrix to get the right number of electrons for spin 2<br>                 # Electrons             Trace(P)              Scaling factor<br>                          16               13.500                       1.185</span><br><br></div><div>Can anyone explain what is happening here and how I allow the system to be magnetic? Is there a keyword I need to add?<br></div><div><br></div></div>