Dear CP2K users,<div><br /></div><div>I'm encountering convergence problems when trying to optimize the bulk iron supercell consisting from 64 Fe atoms, i.e. 4x4x4 supercell. I wanted to simulate adsorption of different organic molecules on Fe slab later, so this is my starting point.</div><div><br /></div><div>SCF can't converge no matter what MIXING and DIAGONALIZATION method I apply. I always get something like this:</div><div><br /></div><div>...</div><div> 33 Broy./Diag. 0.70E+00 2.7 1.02510462 -7902.0344477276 2.42E+01<br /> 34 Broy./Diag. 0.70E+00 2.7 1.02694146 -7882.2903511652 1.97E+01<br /> 35 Broy./Diag. 0.70E+00 2.7 1.02572163 -7833.4164745080 4.89E+01<br /> 36 Broy./Diag. 0.70E+00 2.7 1.02859994 -7878.1467068004 -4.47E+01<br /> 37 Broy./Diag. 0.70E+00 2.7 1.02924599 -7812.2513589335 6.59E+01<br /> 38 Broy./Diag. 0.70E+00 2.7 1.02822047 -7899.1170081476 -8.69E+01<br /> 39 Broy./Diag. 0.70E+00 2.7 1.02715598 -7876.2960251819 2.28E+01<br /> 40 Broy./Diag. 0.70E+00 2.7 1.02871900 -7939.8877789157 -6.36E+01<br /> 41 Broy./Diag. 0.70E+00 2.7 1.02766599 -7827.2772337753 1.13E+02<br /> 42 Broy./Diag. 0.70E+00 2.7 1.02780452 -7823.8921903136 3.39E+00<br /> 43 Broy./Diag. 0.70E+00 2.7 1.02878646 -7862.7815187639 -3.89E+01<br /> 44 Broy./Diag. 0.70E+00 2.7 1.02806441 -7910.5114238974 -4.77E+01<br /></div><div>...</div><div><br /></div><div>I followed the instructions from the previous discussions here in group and assembled the attached input file. Also, I looked for discussions regarding metallic systems including Fe such as:</div><div>https://groups.google.com/g/cp2k/c/ugkJLz4PSSI/m/C-ProBR6BwAJ</div><div><br /></div><div>I have an experience with the CP2K and molecular systems but not for solid state calculations.</div><div><br /></div><div>I also tried the following:</div><div>1) To use the smaller cell and MONKHORST-PACK Scheme (somewhere I saw that for cp2k it is recommended to perform calculations on the supercells)</div><div>2) To introduce a small random displacement in the system</div><div>3) To change ALPHA, BETA and other parameters within the MIXING section.</div><div>4) To try different MULTIPLICITY and initial MAGNETIZATION for Fe atoms.</div><div>but problem persists.</div><div><br /></div><div>I'm not sure what RELAX_MULTIPLICITY constant to use and if MAGNETIZATION and MULTIPLICITY are correct in this case. Need clarification on this as well.</div><div><br /></div><div>I attached my input and coord file, not sure where I'm making mistake.</div><div><br /></div><div>Thanks in advance!</div><div><br /></div><div>All best,</div><div>Branislav</div><div><br /></div><div> </div>
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