Isaiah, I'm not familiar with the workings of QE, but without solution of the full Eliashberg equations it must be using the Allen-Dynes equation (as most do) to obtain Tc.
The basic fact is that with a standard Coulomb repulsion mu-star = 0.10-0.15, with lambda less than 0.3 or so there will be no superconductivity. The A-D equation was not fit to tiny values of Tc and no one should be interested in those results. If non-zero, they will be extremely sensitive to lambda, as you can see. [And you can get nonsensical large values! as you can see] So just accept that if lambda < 0.3 or so, any results cannot be trusted and its not an interesting el-ph superconductor. Warren Warren E. Pickett Distinguished Professor of Physics Department of Physics University of California Davis Davis CA 95616, USA Cell: 530-220-2138 On Fri, Jul 28, 2017 at 12:24 AM, Isaiah Moses <imose...@gmail.com> wrote: > Dear everyone, > > I did an el-ph calculation of a monoclinic structure and am getting really > strange values of Tc . See the result below > lambda omega_log T_c > 0.00994 112.048 0.10012314E+08 > 0.03760 92.373 0.13380511E+10 > 0.07564 90.247 0.39802174E+19 > 0.09959 89.414 0.19865362E+78 > 0.11010 89.463 0.40671597-151 > 0.11454 90.329 0.16986711E-65 > 0.11678 92.320 0.99512429E-51 > 0.11772 94.657 0.29927798E-46 > 0.11744 97.141 0.16242032E-47 > 0.11619 99.442 0.65514785E-54 > > I'm wondering why such values. > > Any comment shall be greatly appreciated. > > Thanks, > Isaiah > > -- > Isaiah Abu Moses > Graduate Student, > Physics Department, > University of Ibadan, > Nigeria > > _______________________________________________ > Pw_forum mailing list > Pw_forum@pwscf.org > http://pwscf.org/mailman/listinfo/pw_forum >
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