EPW Forum

Dear Nina and Shashi, Thanks again for your replies, You can see that when my fsthick was 0.1 eV (earlier posts in the same thread), the Tc was higher (more than 60K) but when my fsthick was increased to 0.2 eV or more, the Tc dropped to around 2K. I am not at all sure what is this supposed to mean ...

Dear Shashi, The bands 22 and 23 are above the fermi level and this is the best spread I am getting by fitting erfc according to the scdm method. So, I have removed the bands. However, there is no significant effect on the results. Further, I have also tried to improve the results by changing ...

Dear Shashi, Thanks for the quick reply again. I have used the SCDM method for wannierization with mu and sigma estimated based on projectability vs energy plot. Here are the results from the xmgrace non linear curve fitting method based on the function: y = 0.5 * erfc( ( x - A0 ) / A1 ) chi-square ...

Dear Shashi, Thank you for your reply. Yes, I have compared the phonon results using 4x4x4 q-grid. I have also compared the results for 12x12x12 and 36x36x36 nqf grids. There is no difference in results as you can see below: For 36x36x36 nqf grid: Electron-phonon coupling strength = 1.4468534 ...

Hello everyone, I'm trying to compute the superconducting critical temperature (Tc) for a material using EPW, but I’m encountering an issue with the electron-phonon coupling constant (λ) being much larger than expected. In the original publication, λ is reported to be around 0.2, with Tc > 65 K. Ho ...