<br>Dear Gabriele<br><br><br> Many thanks for your answer. I replaced ngauss=-1 by ngauss=0 and now I don't see any negative value. Also, occupations = 'tetrahedra'<br> and degauss=0.03 have been used for the nscf calculation.<br>
<br> Truly Yours<br> B. Koa<br> Azad University (Saveh Branch)<br> Iran <br><div class="gmail_quote"><div><br> <br></div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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Dear Koa (please specify your affiliation),<br>
<br>
<br>
On 09/22/2010 11:01 PM, B. Koa wrote:<br>
><br>
> Dear PWScf Users and Gabriele<br>
><br>
> As I have read in the tutorial_magn.pdf which prepared by Paolo<br>
> Giannozzi they are too close to each other but not exactly the same as<br>
> each other and I don't understand the meaning of dosup and pdosup in<br>
> the pdos_tot file well; but generally I know the definition of DOS and<br>
> PDOS.<br>
<br>
So it should be easy for you to understand: dosup is the DOS for up-spin<br>
states, while pdosup is the PDOS for up-spin states. Since you know the<br>
definitions of DOS and PDOS, you must be able to understand why they are<br>
not the same and why they can be almost equal in some energy range (the<br>
agreement is usually better at lower energies).<br>
<br>
<br>
> Also some values of dosup and pdosup in the pdos_tot file have<br>
> negative sign ! (at higher energies ) but there are not such negative<br>
> sign of dosup in the *.dos file. What do the negative values mean?<br>
<br>
Negative values in the PDOS (and in the DOS as well) may appear if you<br>
have used a smearing function like the Methfessel-Paxton one. For<br>
plotting the DOS it is usually more convenient to adopt the gaussian<br>
smearing (ngauss=0), even if you used a different one in the scf/nscf<br>
calculations. For computing DOS integrals, instead, you should use the same.<br>
<br>
<br>
<br></blockquote></div>