<div dir="ltr"><div>Hi Jia,<br><br></div>I would start with Elk and I'm sending an example input file. More information about essential convergence tests necessary to obtain some initial results can be found at<br><br><a href="http://elk.sourceforge.net/faq.html" target="_blank">http://elk.sourceforge.net/<wbr>faq.html</a><br><div><div><a href="http://elk.sourceforge.net/elk.pdf" target="_blank">http://elk.sourceforge.net/<wbr>elk.pdf</a><br></div></div><div class="gmail_extra"><br></div><div class="gmail_extra">Try starting with the default atomic species configuration files.</div><div class="gmail_extra"><br></div><div class="gmail_extra">Cheers!<br></div><div class="gmail_extra"><br></div><div class="gmail_extra"><span class="gmail-m_5376046619131891037m_-6321344893763153737m_6333377370348176066gmail-m_-7443609597193345283gmail-m_-4627483426385706070m_-3659475676208332197gmail-m_318366166282958700m_-4069557267744183932m_3925019048408858411m_5074883181905464774gmail-il">Ary Ferreira<br></span><span class="gmail-m_5376046619131891037m_-6321344893763153737m_6333377370348176066gmail-m_-7443609597193345283gmail-m_-4627483426385706070m_-3659475676208332197gmail-m_318366166282958700m_-4069557267744183932m_3925019048408858411m_5074883181905464774gmail-il"><br><span class="gmail-m_5376046619131891037m_-6321344893763153737m_6333377370348176066gmail-m_-7443609597193345283gmail-il">FAPESP</span> </span><span class="gmail-m_5376046619131891037m_-6321344893763153737m_6333377370348176066gmail-m_-7443609597193345283gmail-m_-4627483426385706070m_-3659475676208332197gmail-m_318366166282958700m_-4069557267744183932m_3925019048408858411m_5074883181905464774gmail-il">postdoctoral</span> fellow<br><span class="gmail-m_5376046619131891037m_-6321344893763153737m_6333377370348176066gmail-il"><span class="gmail-il">UFSCar</span></span> - Brazil</div><div class="gmail_extra"><br></div><div class="gmail_extra"><div class="gmail_quote">On Mon, Oct 9, 2017 at 9:13 AM, Davide Ceresoli <span dir="ltr"><<a href="mailto:davide.ceresoli@cnr.it" target="_blank">davide.ceresoli@cnr.it</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Dear Jia,<br>
I have to admit that this is the first time that NMR/EFG results<br>
depend so much on the choice of the pseudopotential. I've calculated<br>
a bunch of minerals, both with NC and US pseudos, and results are<br>
in good agreement each other.<br>
<br>
I've tested several Co pseudos (NC, NC+semicore, PAW+semicore) on<br>
Co3O4 spinel and the EFG results span the entire real numbers range,<br>
both for Co and for O.<br>
<br>
Which one is correct? I don't know. I'm in favor of pseudopotentials<br>
with semicore states. They should be closer to all-electron.<br>
<br>
Do you have some reference with Co EFG calculated all-electron (wien2k,<br>
elk/exciting) on some simple system? If not, is there someone that<br>
could help us to setup a wien2k/elk calculation?<br>
<br>
Best regards,<br>
Davide<br>
<div><div class="gmail-m_7765125512307914128h5"><br>
<br>
<br>
<br>
<br>
On 09/20/2017 06:50 PM, Jia Chen wrote:<br>
> Dear All,<br>
><br>
> I am working on calculating nmr parameters with gipaw code. I have two settings:<br>
> one with norm-conserving gipaw pesudopotentials which has some semi-core states,<br>
> and the other with ultra-soft gipaw pseudopotentials. Electronic structure<br>
> eigenvalues from pwscf look similar, and chemical-shift are not far away from<br>
> each other. The issue is quadrupolar coupling, for Co, norm-conserving<br>
> calculation gives 0.5MHz and ultra-soft gives 1.5MHz. It seems to me a<br>
> significant discrepancy. I don't know what caused the inconsistency, and which<br>
> one is more reliable. I appreciate any insight on this problem.<br>
><br>
> One thing about norm-conserving calculation is that the code gives warming about<br>
> some orbitals has zero norm. I don't know if that could be of concern.<br>
><br>
> Cheers<br>
> Jia<br>
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