<div dir="ltr">Dear Yue Yu,<div><br></div><div>To my knowledge, if nstep_path is 1 it will just do one single scf cycle for each of your images without any relaxation. If nstep_path=2 it will do 2 scf cycles with an intermediate ionic relaxation step.</div><div><br></div><div>Simply stated, your nstep_path should be large enough such that your calculation converges with respect to the variable "path_thr" (which is the norm of the force orthogonal to the path). <br></div><div><br></div><div>Kind regards,</div><div><div style="font-size:12.8px">Anand C.</div><div style="font-size:12.8px">Post-doctoral researcher</div><div style="font-size:12.8px">Materials Theory and Simulation Group</div><div style="font-size:12.8px">Indian Institute of Science, Bangalore, India</div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Aug 23, 2016 at 9:59 PM, Yu,Yue <span dir="ltr"><<a href="mailto:yuyue1995@ufl.edu" target="_blank">yuyue1995@ufl.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal">Dear all,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">In input file for neb.x of Quantum Espresso, there is a parameter called "nstep_path", which is described as number of ionic + electronic steps in the manual.
<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Does the "electronic steps" means the scf iteration number limit? And does the "ionic steps" means the total steps the ions will be moved? What is physical meaning of their sum?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">For my system, the total atom number is 219, and I want to set 10 images between initial and final configuration (which differs by only few atoms' position), what value of "nstep_path" should I take?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Could anyone be so kind to provide me a neb input file example?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thanks a lot!<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Yue Yu<u></u><u></u></p>
<p class="MsoNormal">Ph. D student<u></u><u></u></p>
<p class="MsoNormal">Department of Physics, University of Florida<u></u><u></u></p>
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