Dear All I calculate the lattice constant of ZnO. The total energy is minimum at this lattice constant but force is not zero (P=-20 Kbar) at this lattice consatnt... My question is that How I can get minimum total energy and zero forces (P=0) at same lattice constanant.... ? Muhammad Zafar PhD Scholar Department of Physics The Islamia University of Bahawalpur,Pakistan -------------- next part -------------- An HTML attachment was scrubbed... URL: http://pwscf.org/pipermail/pw_forum/attachments/20140524/1ffa1734/attachment.html
