The factors related to formation energy

[zhaoru_sun1]

Hello everyone,

I am trying to repeat the work E. C. H. Sykes et al., J. Phys. Chem. C 120, 10879 (2016), in which the formation energy Ef of CuxO/Cu(111) layer is calculated. I keep using the same input parameters mentioned in the literature, including INCAR, POSCAR, POTCAR and KPOINTS. But the resulting formation energy is very different, as shown below:

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Ef (paper) = 1.99 eV/per Oxygen atom
Ef (mine) = 1.53 eV/per Oxygen atom

I tried to change some parameters, initial structure and pseudopotentials, but it didn't make much difference. I'm confused? Can someone give me a clue? The relevant INPUT&OUTPUT files are uploaded in the attachment.

[merzuk.kaltak]

Hello,

sometimes important technical details are left out in papers for the sake of simplicity.
I suggest to contacting the authors of the paper.