I'm trying to use DFPT in VASP to calculate the dielectric constant of BaTiO3 (tetragonal). However, I am confused about how to deal with the result. According to my understanding, the static dielectric constant value can be extracted from the outcar file (attached below), with "MACROSCOPIC STATIC DIELECTRIC TENSOR " as an electronic part and ""MACROSCOPIC STATIC DIELECTRIC TENSOR IONIC CONTRIBUTION"" as an ionic part, and the corresponding value added. However, when I examined the frequency-dependent dielectric function curve from vasprun.xml with P4VASP, I noticed that the 0-frequency value is completely different. Please help me to make sure about the dielectric constant value from vasp calculation.

If anyone has the same problem, please assist me.

Please correct me if I'm mistaken.

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