<div dir="ltr"><div>Dear PWSCF users,</div>
<div> I try to relax the z-axis of STO while its x- and y-axis are fixed (i.e. relax STO under strain). I use 'vc-relax' and cell_dofree=z. The ion-dynamics is 'damp' and cell_dynamics is 'damp-w'. However I found that this 'Wentzcovitch Damped Dynamics' always does 50 iterations and stops. But the strain along the z direction is not necessarily the smallest after 50 iterations. Usually the z-strain is smallest after some iterations (for example 30 iterations) then it goes up. </div>
<div> I want to ask why the code does not pick up the value of lattice constant of z direction which minimizes the strain in the z direction but just picks up the final value of lattice constant after 50 iterations?</div>
<div> Thank you very much.</div>
<div> </div>
<div>Hanghui Chen</div>
<div>Department of Physics</div>
<div>Yale University</div></div>