<meta http-equiv="Content-Type" content="text/html; charset=GB18030"><pre style="margin-top: 0px; margin-bottom: 0px;"><p class="ds-markdown-paragraph" style="margin: 13.716px 0px; font-size: 16.002px; line-height: 28.575px; color: rgb(64, 64, 64); white-space-collapse: collapse;"><font face="Times New Roman" style="">Dear QE Users and Developers,</font></p><p class="ds-markdown-paragraph" style="margin: 13.716px 0px; line-height: 28.575px; color: rgb(64, 64, 64); white-space-collapse: collapse;"><font size="4" style="" face="Times New Roman">I am encountering some confusion regarding parameter selection while using Quantum ESPRESSO to calculate the superconducting transition temperature (<em style="">Tc</em>). According to the official documentation, the default/recommended value for the parameter <code style="background-color: rgb(236, 236, 236); border-radius: 4px; padding: 0.15rem 0.3rem;">el_ph_sigma</code> is 0.02 Ry. However, when reviewing relevant literature, I noticed significant discrepancies in the values chosen by different researchers¡ªfor instance, 0.005 Ry or 0.05 Ry, among others. </font><font size="4" style="" face="Times New Roman">Could you please advise on how to appropriately select the value of <code style="background-color: rgb(236, 236, 236); border-radius: 4px; padding: 0.15rem 0.3rem;">el_ph_sigma</code> in practical calculations, particularly for predicting <em style="">Tc</em>?</font></p><pre style="margin-top: 0px; margin-bottom: 0px;"><font size="4" style="" face="Times New Roman">Thanks a lot!
Best wishes,
Liu R F
LZJTU</font></pre></pre><pre style="margin-top: 0px; margin-bottom: 0px;"><span class=" " style="cursor: pointer; color: rgb(17, 17, 17);"></span></pre>