[QE-users] el_ph_sigma

[LL]

Dear QE Users and Developers,

I am encountering some confusion regarding parameter selection while using Quantum ESPRESSO to calculate the superconducting transition temperature (Tc). According to the official documentation, the default/recommended value for the parameter el_ph_sigma is 0.02 Ry. However, when reviewing relevant literature, I noticed significant discrepancies in the values chosen by different researchers—for instance, 0.005 Ry or 0.05 Ry, among others. Could you please advise on how to appropriately select the value of el_ph_sigma in practical calculations, particularly for predicting Tc?
Thanks a lot! Best wishes, Liu R F LZJTU
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