<div dir="ltr"><div>Dear all,</div><div><br></div><div>
I used lambda.x to calculate Tc for MgB2, as it explained in the PHonon/.../example03.I have a question about the q-points and in the <a href="http://lambda.in">lambda.in</a>
input file.
<br></div><div>First time I used the sequence and weights of q-points calculated by kpoints.x
and I got Tc=9 K which is not correct.</div><div>Second time I used the sequence and weights of q-points calculated
by ph.x and I got 44 for Tc which is almost consistent with literature.</div><div>Can anyone help me find out which one is basically right?</div><div>I wonder why it is needed to reproduce q points by means of kpoints.x while these q points are presented in ph.out and also elph_dir/elph.inp_lambda.* files. Is it related to the algorithm of labmda.x, or the algorithm of kpoints.x?<br></div><div><br></div><div>
Thanks and Regards
<br></div><div><br></div><div>==================================<br></div><div>Input file:</div><div>==================================</div><div>&CONTROL<br> calculation='scf'<br> restart_mode='from_scratch',<br> outdir='tmp',<br> prefix='mgb2',<br> pseudo_dir = '/home/pseudo/',<br> tstress =.TRUE.,<br> tprnfor= .TRUE. ,<br> verbosity='high' ,<br>/<br>&SYSTEM<br> ibrav =4,<br> celldm(1)= 5.824,<br> celldm(3)=1.141,<br> nat = 3,<br> ntyp = 2,<br> nspin = 1,<br> ecutwfc = 120,<br> occupations = 'smearing',<br> degauss= 0.01,<br> smearing= 'mp',<br> la2f=.true.<br>/<br>&ELECTRONS<br> conv_thr=1.D-11,<br> mixing_beta=0.3,<br>/<br>ATOMIC_SPECIES<br> Mg 24.305 Mg.pbe-hgh.UPF<br> B 10.811 B.pbe-hgh.UPF<br><br>ATOMIC_POSITIONS (crystal)<br> Mg 0.000000000 0.000000000 0.000000000<br> B 0.333333333 0.666666666 0.500000000<br> B 0.666666666 0.333333333 0.500000000<br><br>K_POINTS (Automatic)<br> 12 12 10 0 0 0<br>==========================================</div><div>electron-phonon coefficients for MgB2<br>&inputph<br> tr2_ph=1.0d-14,<br> prefix='mgb2',<br> fildvscf='mgb2dv',<br> amass(1)=24.305,<br> amass(2)=10.811,<br> outdir='tmp',<br> fildyn='mgb2.dyn',<br> electron_phonon='interpolated',<br> el_ph_sigma=0.005,<br> el_ph_nsigma=10,<br> trans=.true.,<br> ldisp=.true.<br> nq1=6, nq2=6, nq3=5,<br> /<br>===========================================<br></div><div><br></div><div>
<div>M Moaddeli, PhD</div><div>Pasargad HEI, Shiraz, Iran</div>
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