Hello ZAARI
I am also face the same problem in calculation el-ph coupling constant for
Hesuler systems
i tried in the following ways ( though problem still remain anyway for your
system one may solve this problem)
1. check whether your getting -ve frequency in ph.x run
2. increse k point grid in scf and nscf runs ( but 2x2x2 is enough in
epsilon,
i think )
3. reduce tr2_ph in el-ph calculation (ph.x)
?
*------------------------------------*
*Muthu.V ?Project FellowDept. of Theoretical Physics?Madurai Kamaraj
Universit*
*?y India*
*------------------------------------*
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