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<p>Dear Alejandro,</p>
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<p>the threshold for the forces is for forces on each atom, not the total force. <br>
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<p>Did you check also that?</p>
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<p>Best regards</p>
<p>Chiara Cignarella</p>
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<p>----------------------------------</p>
<p>PhD student</p>
<p>EPFL, MED 2 1023</p>
<p>Lausanne<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>Da:</b> users <users-bounces@lists.quantum-espresso.org> per conto di Alejandro Lasso Castillo via users <users@lists.quantum-espresso.org><br>
<b>Inviato:</b> mercoledì 12 giugno 2024 16:59:55<br>
<b>A:</b> users<br>
<b>Oggetto:</b> [QE-users] Relaxation on LaTe3</font>
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Dear users,</div>
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I am currently trying to perform phonon calculations on LaTe3, and one keypoint in order to have good results is a very well relaxed structure. For this purpose I use a force threshold of 1d-05 (see input file attached).</div>
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However, I find that it is very difficult to achieve this threshold (and it becomes harder when increasing the density of k-points). For a k-grid of 12 x 2 x 12 I try to relax the structure and eventually the bfgs algorithm gets stuck</div>
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into the same three configurations. <span style="color: #000000; font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #fdfdfd; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;" data-mce-style="color: #000000; font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #fdfdfd; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">
My strategy so far has been to reintroduce the best structure from the output into the input file and relaunch it but I can not achieve forces less than 6d-05.</span>
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I ask you for some advice in order to achieve my threshold in case you have some experience with this kind of materials.</div>
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<div><span style="font-size: 18pt;"><strong>Alejandro Lasso Castillo</strong></span><br>
<em>Erasmus Mundus Joint Master Student</em><br>
<em>Quantum Science and Technologies (QUARMEN)</em></div>
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