<div dir="ltr"><div>RMTs are Sr:2.05, Ti:1.70, Ta:1.80, O:1.55. For your reference, structure file is attached. <br></div><div>6 k points in IBZ (ndiv:3, 3, 3), simple GGA calculation.</div><div><br></div><div>**"With expected RMTs for STO I don't expect rkmax=5.5 to be adequate"**</div><div>Yes Dr. Marks, I agree with you. 6.5 would have been ok. But i need EFG values accurate to just 0.1 order and not 0.01 (considering the huge computational time it will take to converge for rkmax:6.5).</div><div><br></div><div></div><div>**"and 4.0 is silly"**</div><div>I was trying to optimize structure first with lower rkmax and then with actual rkmax. I got to know this method from various mailing list threads. one shared here. However, with actual rkmax :DIS very very slow or i can say not converging at all.<br></div><div><a href="https://www.mail-archive.com/wien@zeus.theochem.tuwien.ac.at/msg00344.html">https://www.mail-archive.com/wien@zeus.theochem.tuwien.ac.at/msg00344.html</a> <br></div><div><br></div><div>** i think your chemistry is wrong as well**<span class="gmail-im"><br></span></div><div><span class="gmail-im">You must be saying this with the thought "why Ta will have +4 OS". My reasoning: i just want to match my experimentally obtained EFG, asymmetry parameter with the theoretical calculations. I also want to check existence of different charge states of Ta in Strontium titanate. please see one such study reported "coexistence of different charge states of Ta doped monoclinic Hafnia." <br></span></div><div><span class="gmail-im"><a href="https://journals.aps.org/prb/abstract/10.1103/PhysRevB.82.165203">https://journals.aps.org/prb/abstract/10.1103/PhysRevB.82.165203</a></span></div><div><span class="gmail-im"><br></span></div><div><span class="gmail-im">Procedure i followed till now 1. created 3x3x3 supercell of strontium titanate, replaced one Ti with one Ta ; (2). :ENE & :DIS converged; (3). force convergence and structure optimization (here noted EFG value); (4). Made supercell a charged supercell (5). :ENE converged but :DIS not converged. <br></span></div><div><span class="gmail-im"><br></span></div><div><span class="gmail-im">Please let me know what should i do to make it converge. And i request you to elaborate your thoughts if i m doing mistake somewhere,</span></div><div><span class="gmail-im"><br></span></div><div><span class="gmail-im">thanking you,</span></div><div><span class="gmail-im">A. kumar<br></span></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jun 8, 2020 at 2:20 AM Laurence Marks <<a href="mailto:laurence.marks@gmail.com">laurence.marks@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">You are still not providing information. With expected RMTs for STO I don't expect rkmax=5.5 to be adequate, and 4.0 is silly. I think your chemistry is wrong as well.<br><br><div dir="auto">_____<br>Professor Laurence Marks<br>"Research is to see what everybody else has seen, and to think what nobody else has thought", Albert Szent-Gyorgi<br><a href="http://www.numis.northwestern.edu" rel="noreferrer" target="_blank">www.numis.northwestern.edu</a></div><br><div class="gmail_quote" dir="auto"><div dir="ltr" class="gmail_attr">On Sun, Jun 7, 2020, 15:29 Ashwani Kumar <<a href="mailto:ashwani.ism@gmail.com" rel="noreferrer" target="_blank">ashwani.ism@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hello Dr. Marks,<br><div> I could not explain myself due to 40 kb size limitation. I want to calculate EFG, asymmetry parameter at Ta in Ta-doped Strontium titanate (3x3x3) supercell. Replaced 1 Ti atom with Ta atom. SCF converged well for neutral supercell (Ta in +4 OS). Then did force convergence and minimization to obtain optimized structure. Now supercell is made charged by adding 1e in <b>case.in2</b> and <b>case.inm </b>edited by adding 1.0 (for Ta=+5 OS). SCF (:DIS and :ENE) converged for rkmax=4.0 but :DIS is not converging for rkmax=5.5. I wanted to speed up my calculation so initially started with rkmax=4.0 and then with rkmax=5.5 for charged supercell. <br></div><div><br></div><div>thanking you,</div><div>A. kumar<br></div></div><br><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Jun 7, 2020 at 3:30 AM Laurence Marks <<a href="mailto:laurence.marks@gmail.com" rel="noreferrer noreferrer" target="_blank">laurence.marks@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">You have not provided enough information for anyone to guess. Basic info is described in the list recommendation, and include:<div dir="auto">1) RMTs</div><div dir="auto">2) K-points</div><div dir="auto"><a href="https://urldefense.com/v3/__http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien__;!!Dq0X2DkFhyF93HkjWTBQKhk!AFiPfyQM8zguM3SP3oQzSO6Z3AFjFyj9MjzxIcoj4gzyO_zrgXHTxNtCisKneD01QdFMHA$" rel="noreferrer noreferrer" target="_blank">http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien</a><br><div dir="auto"><br></div></div></div>
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