[Pw_forum] SCF calculations do not converge

2011-11-21 Thread IYAD AL-QASIR
Hello All, I am trying to calculate the phonon dispersion relations and phonon density of states of UO2. Please find the attached files UO2.scf.in and UO2.ph.in The calculations assume GGA and include spin-polarized effects. There are 6 representations and nine modes. The problem I have is: When

[Pw_forum] SCF calculations do not converge

2011-11-22 Thread mohnish pandey
Dear Aiyad ! Try reducing "mixing_beta"(make it ~ 0.2 to 0.5) and your "ecutwfc" is too large.. I think 40-50 Ryd will suffice. Since you are using ultrasoft pseudopotential your ecutrho should be atleast 8 times the ecutwfc. And the value of the convergence threshold that you have set is too low.