Dear all,<br /><br />To add one more point. <br />As it was said, using a reference cell might solve this problem (https://groups.google.com/g/cp2k/c/N52jLt2yAIQ/m/JAlV3KTVUtIJ). You will notice that I used &CELL_REF in my input script, which did not solve my problem.<div><br />Thanks.<br />Kejiang<br /><br /></div><div class="gmail_quote"><div dir="auto" class="gmail_attr">On Monday, November 20, 2023 at 9:00:11 AM UTC+8 Kejiang Li 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;"><div>Dear CP2K community,<br><br>I am calculating the EOS for FeO with a 2*2*2 supercell. But there is always a significant discontinuity (sharp decrease) in the range of 4.3-4.4 angstrom lattice constant in the EOS curves, as shown in the figures below.<br><br>I have done the following tests:<br>- the convergence of the energy with different cutoffs;<br>- using different functionals, including PBE, HSE, and SCAN;<br>-including HSE with different HF fractions;<br>-using different magnetization and +U settings. <br>However, all the tests produce similar results with an apparent discontinuity (4.3-4.3 A) .<br><br>This discontinuity is not observed in the Quantum Espresso results conducted by myself and in the results of literature that generally used VASP. I believe that the CP2K program might cause this problem.<br><br>Can you give me more suggestions on how to do further tests?<br><br>Here, I also attached one sample code I used during my tests.<br><br>Thanks a lot.<br><br>Best regards,<br>Kejiang<br>The University of Science and Technology Beijing<br><br></div><img alt="cp2k_functionals.jpg" width="534px" height="336px" src="https://groups.google.com/group/cp2k/attach/9606971979e0d/cp2k_functionals.jpg?part=0.2&view=1"><br><div><img alt="cp2k_mag_u.jpg" width="534px" height="381px" src="https://groups.google.com/group/cp2k/attach/9606971979e0d/cp2k_mag_u.jpg?part=0.4&view=1"><img alt="cp2k_mag_u2.jpg" width="534px" height="346px" src="https://groups.google.com/group/cp2k/attach/9606971979e0d/cp2k_mag_u2.jpg?part=0.3&view=1"><br></div></blockquote></div>
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