<font face="Times New Roman" size="4">Dear All,</font><div><font face="Times New Roman" size="4"><br /></font></div><div><p style="border: 0px solid rgb(217, 217, 227); box-sizing: border-box; margin: 0px 0px 1.25em; color: rgb(55, 65, 81); white-space: pre-wrap; background-color: rgb(247, 247, 248);"><font face="Times New Roman" size="4">I utilized cp2k for DFT+U cell optimization of CeO2, expecting faster processing. However, after testing various parameters for cell optimization, I observed slow SCF convergence, which resulted in a time-consuming cell optimization process of nearly 3 hours.</font></p><p style="border: 0px solid rgb(217, 217, 227); box-sizing: border-box; margin: 1.25em 0px; color: rgb(55, 65, 81); white-space: pre-wrap; background-color: rgb(247, 247, 248);"><font face="Times New Roman" size="4">The reference cell parameters were 5.47 x 5.47 x 5.47. The DA-calculated cell parameters were 5.484, which is acceptable, but it took nearly 3 hours to finished the cell optimization run. However, OT required over 3 hours to complete one ionic step, and never got any information for force.</font></p><p style="border: 0px solid rgb(217, 217, 227); box-sizing: border-box; margin: 1.25em 0px; color: rgb(55, 65, 81); white-space: pre-wrap; background-color: rgb(247, 247, 248);"><font face="Times New Roman" size="4">I have attached my input and output files containing the results for both DA and OT.</font></p><p style="border: 0px solid rgb(217, 217, 227); box-sizing: border-box; margin: 1.25em 0px 0px; color: rgb(55, 65, 81); white-space: pre-wrap; background-color: rgb(247, 247, 248);"><font face="Times New Roman" size="4">I would greatly appreciate any suggestions to address this issue.</font></p></div><div><font face="Times New Roman" size="4"><br />Thank you !</font></div><div><font face="Times New Roman" size="4"><br /></font></div><div><font face="Times New Roman" size="4"><br /></font></div><div><font face="Times New Roman" size="4">Best,</font></div><div><font face="Times New Roman" size="4">Jessie</font></div><div><font face="Times New Roman" size="4"><br /></font></div><div><font face="Times New Roman" size="4"><br /></font></div>
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