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Dear all,

I find that when I am trying to do a Berry phase calculation within the HSE06 scheme, VASP changes my lattice vectors. That is, I have a ZB primitive unit cell as input

LATTYP: Found a face centered cubic cell.
ALAT = 4.3637300000

Lattice vectors:

A1 = ( 0.0000000000, 2.1818650000, 2.1818650000)
A2 = ( 2.1818650000, 0.0000000000, 2.1818650000)
A3 = ( 2.1818650000, 2.1818650000, 0.0000000000)

But for the Berry phase HSE06 calculation VASP does the following to my cell

LATTYP: Found a base centered monoclinic cell.
ALAT = 5.3444559376
B/A-ratio = 0.5773502692
C/A-ratio = 0.8164965830
COS(beta) = -0.7070714241

Lattice vectors:

A1 = ( 2.1818650000, 0.0000000000, 2.1818650000)
A2 = ( 2.1818650000, 2.1818650000, 0.0000000000)
A3 = ( -4.3637300000, 0.0002181865, 0.0002181865)

This changes the geometry of the cell and reduces the symmetry! How can I avoid it?

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