Hello,<div>I ran your system with a few tweaks (went back to pseudos and molopt basis) and it seemed reasonably well behaved.</div><div>I only performed a fixed shape cell_opt not full relaxation. A cell_ref would be better but not sure how it plays with multiple_unit_cell flag.</div><div>Cell parameters came out as:</div><div>ut.out: CELL| Vector a [angstrom]: 14.111 0.000 0.000 |a| = 14.110920<br>out.out: CELL| Vector b [angstrom]: 0.000 9.973 0.000 |b| = 9.972731<br>out.out: CELL| Vector c [angstrom]: -2.516 -0.000 15.068 |c| = 15.276187<br>which seem reasonable. No idea if your +U value is reasonable or not.</div><div>Matt</div><div class="gmail_quote"><div dir="auto" class="gmail_attr">On Tuesday, 20 September 2022 at 13:31:31 UTC+1 mdsimula...@gmail.com wrote:<br/></div><blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Hello,<div><br></div><div>I have been trying to optimize a bulk CuO using PBE and PBEsol with D3. I've tried GPW and GAPW with various combinations of basis sets, kpoints and broken symmetry and have not been able to match the optimized geometry from VASP.</div><div><br></div><div>The goal is to study adsorption onto the CuO surface. I'm wondering, if I constrain the CuO slab in the experimentally determined coordinates and cell length/angles, if the adsorption results would be trustworthy?</div><div><br></div><div>Overall, I must admit, that I'm somewhat surprised and disappointed in CP2K's lack of ability to match both experimentally and calculated results. So again, my real question is, can the results be trusted, given that I have been unable to recreate the first step of the process?</div><div><br></div><div>Best regards,</div><div>Frank</div><div><br></div><div><br></div></blockquote></div>
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