I started recently using EPW to calculate superconductors' transition temperatures. I am puzzled by the following result I am getting:
I am guessing the first lambda is just the average of phonon modes lambdas over the Brillouin zone. Also, I assume that l_a2f is calculated using Eq. (1) and (3) from https://journals.aps.org/prb/pdf/10.110 ... evB.12.905 . I would expect these two values to be equal and looking through previous posts here they appear to be the same in most posts.lambda : 1.7232748
lambda_tr : 2.3592576
Estimated Allen-Dynes Tc
logavg = 0.0119050 l_a2f = 1.1669279
My question is should they always be equal? If so, does them being different tell me about what I need to change in my approach (smearing parameters, grids, etc). If they should not always be equal, is there a way to get l_a2f though mode resolved lambdas? Also, I would like to add that just looking at the formulas I would expect them to be equal always.