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Dear Admin,
I have small query with regards to DFPT calculation for piezoelectric tensor calculation.
Does it calculates clamped-ion and relaxed-ion simultaneously in the OUTCAR file?
are the values after " PIEZOELECTRIC TENSOR (including local field effects) for field in x, y, z " this line are clamped-ion piezo tensor?
and
the values after " PIEZOELECTRIC TENSOR IONIC CONTR for field in x, y, z " this line are relaxed-ion piezo tensor?

Thanks

Dear prince_sharma,

For this question I would like to refer you to the vasp wiki of the tag LCALCEPS.
wiki/index.php/LCALCEPS
PIEZOELECTRIC TENSOR (including local field effects), are clamped-ion piezoelectric tensors, as stated in the wiki.

I hope this answers your question

All the best Jonathan