<div dir="ltr">Dear Lorenzo,<div><br></div><div>I have the same problem - cannot achieve SCF convergence. I use higher ecutwfc = 39.0, ecutrho = 300 but not coverging.</div><div><br></div><div>Regards, Maxim Arsentev.</div></div><div class="gmail_extra"><br><div class="gmail_quote">2016-12-09 12:52 GMT+04:00 Lorenzo Paulatto <span dir="ltr"><<a href="mailto:lorenzo.paulatto@impmc.upmc.fr" target="_blank">lorenzo.paulatto@impmc.upmc.fr</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear Sayan,<br>
it looks to me like your unit cell is too small, the atoms are all crumped<br>
together. Please note that celldm(1) is specified in bohr atomic units.<br>
<br>
Also:<br>
1. a cutoff of 30Ry is probably very small for BHS pseudopotentials<br>
2. ecutrho=default (4*ecutwfc ) is probably not enough for all the ultrasoft<br>
pseudopotentials you are using<br>
<br>
I would recommend you first spend some time reproducin the single-element<br>
metal, and once you can correctly reproduce geometry, band structure, physical<br>
properties, you move to simulating the alloy.<br>
<br>
HTH<br>
<span class=""><br>
On Friday, December 9, 2016 1:59:44 PM CET sayan chaudhuri wrote:<br>
> Hi,<br>
> I am running QE self - consistently for my heusler alloy(Fe2TiSn)<br>
> system, where 25% of Sn were replaced by Sb. But after 800 iterations and<br>
> almost 3 hours of running also still it is not converged.<br>
> The code I am using is added bellow. Please tell me what is the source of<br>
> error.<br>
><br>
> Thanking you,<br>
> Sayan Chaudhuri<br>
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</span>> *&control prefix='fts', calculation = 'scf', verbosity =<br>
<span class="">> 'low', pseudo_dir = '/home/ltp/Desktop/espresso-5.<wbr>4.0/pseudo',<br>
> outdir = './tmp', / &system ibrav=2 celldm(1)=11.43,<br>
> nat=16, ntyp=4, nspin=2, ecutwfc=30.0,<br>
> starting_magnetization(1) = 0.0, starting_magnetization(2) = 0.0,<br>
> starting_magnetization(3) = 0.5, starting_magnetization(3) = 0.0,<br>
> occupations='tetrahedra', / &electrons electron_maxstep = 3000,<br>
> diagonalization = 'david', mixing_mode = 'plain', conv_thr = 1e-8,<br>
</span>> mixing_beta=0.1, /ATOMIC_SPECIES Sb 121.76 Sb.pz-bhs.UPF Sn<br>
<span class="">> 118.71 Sn.pz-dn-rrkjus_psl.0.2.UPF Fe 55.845 Fe.pz-sp-van_ak.UPF<br>
</span>> Ti 47.867 Ti.pz-sp-van.UPFATOMIC_<wbr>POSITIONS {crystal} Sb<br>
<span class="">> 0.000000000 0.000000000 0.000000000 Sn<br>
> 0.000000000 0.500000000 0.500000000 Sn<br>
> 0.500000000 0.000000000 0.500000000 Sb<br>
> 0.500000000 0.500000000 0.000000000 Fe<br>
> 0.250000000 0.250000000 0.250000000 Fe<br>
> 0.750000000 0.750000000 0.750000000 Fe<br>
> 0.750000000 0.750000000 0.250000000 Fe<br>
> 0.250000000 0.250000000 0.750000000 Fe<br>
> 0.750000000 0.250000000 0.750000000 Fe<br>
> 0.250000000 0.750000000 0.250000000 Fe<br>
> 0.250000000 0.750000000 0.750000000 Fe<br>
> 0.750000000 0.250000000 0.250000000 Ti<br>
> 0.500000000 0.500000000 0.500000000 Ti<br>
> 0.500000000 0.000000000 0.000000000 Ti<br>
> 0.000000000 0.500000000 0.000000000 Ti<br>
> 0.000000000 0.000000000 0.500000000 K_POINTS {automatic}<br>
</span>> 2 2 2 0 0 0*<br>
<span class="HOEnZb"><font color="#888888"><br>
<br>
--<br>
Dr. Lorenzo Paulatto<br>
IdR @ IMPMC -- CNRS & Université Paris 6<br>
phone: +33 (0)1 44275 084 / skype: paulatz<br>
www: <a href="http://www-int.impmc.upmc.fr/~paulatto/" rel="noreferrer" target="_blank">http://www-int.impmc.upmc.fr/~<wbr>paulatto/</a><br>
mail: 23-24/4é16 Boîte courrier 115, 4 place Jussieu 75252 Paris Cédex 05<br>
<br>
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</font></span></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div>Best wishes,</div><div>Maxim Arsent'ev, Ph.D. (Chemistry)</div><div>Laboratory of research of nanostructures</div><div>Institute of Silicate Chemistry of RAS</div></div></div></div></div>
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