Why cann't use Brenner potential to optimize lattice constraints?
When I am doing unitcell optimization with Brenner in ATK2016.0, the atomics positions will change, but the lattice constraints not change at all. (I have changed the lattice constraints to try again, but not works)
However, when I only change (do not change any setings else) potential to others (such as Tersoff_C_2012 ), lattice constraints will be optimized and changed.
