<div dir="ltr"><div>Dear users and developers,</div><div><br></div><div>Are there any tricks for running an NPT ensemble with pw.x (vc-md) for high-temperatures? I do not have problems with 300-350-400K (reaching minimum Etot+Ekin fluctuations after a reasonable amount of steps) but cannot reach it for 600K. Below I show the basic input parameters used.</div><div><br></div><div>Thank you for any suggestions!</div><div><br></div><div><br></div><div><br></div><div>&CONTROL<br> restart_mode = 'restart'<br> calculation = 'vc-md'<br> nstep = 1000<br> dt = 60 ! 3fs, 1/10 of the highest vibration T<br>! verbosity = 'high'<br> wf_collect = .true.<br> pseudo_dir = '.'<br>/<br>&SYSTEM</div><div>[all good]<br> nosym = .True.<br>/<br>&ELECTRONS<br></div><div>[all defaut]<br></div><div>/<br>&IONS<br> ion_velocities = 'default'<br> tempw = 600<br> ion_dynamics = 'beeman'<br> pot_extrapolation = 'atomic' ! 1st, 2nd order from prev step, no gain<br> wfc_extrapolation = 'none' ! 1st, 2nd order from prev step, no gain<br>! remove_rigid_rot = .True. trick for not big enough supercells<br> ion_temperature = 'rescaling'<br> tolp = 10<br> nraise = 1<br> refold_pos = .True.<br>/<br>&CELL<br> cell_dynamics = 'pr' ! Parrinello-Rahman, also Wentzcovitch 'w' is avail<br>! wmass - fictitious cell mass, see default for 'pr' or 'w'<br> cell_factor = 2<br>/<br><br>ATOMIC_SPECIES<br>...<br><br>ATOMIC_POSITIONS crystal<br>...<br><br>K_POINTS automatic<br>[converged grid tested to give accurate cell stresses]</div><div><br></div><div><br>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>Best wishes,</div><div>Al.<span style="border-collapse:separate;line-height:normal;text-align:-webkit-auto;text-indent:0px;border-spacing:0px"><span style="text-align:-webkit-auto">,</span></span> phd candidate in chemical sciences<br>'I.. a universe of atoms, an atom in the universe' (Richard P. Feynman)<br><a href="https://cpms.kaust.edu.sa/" target="_blank">https://cpms.kaust.edu.sa/</a></div></div></div></div></div>
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