Dear Forum,<br><br>I calculated the energy of a aluminium surface, but the value that i obtained using this is 'extremely high' energy, i obtain the same using 4.2.1 and 4.1 version of QE.<br><br>My input file is :<br>
=========================================<br>&CONTROL<br> calculation = 'scf'<br> prefix = 'al-111-43.5'<br> tprnfor = .true.<br> wfcdir = './restore/'<br>
pseudo_dir = '/home/jperalta/pseudo/'<br> outdir = './restore'<br>/<br>&SYSTEM<br> ibrav = 0<br> celldm(1) = 1.0<br> nat = 21<br>
ntyp = 1<br> ecutwfc = 30<br> ecutrho = 500<br> degauss = 0.03<br> occupations = 'smearing'<br> smearing = 'mv'<br>
nspin = 2<br> starting_magnetization= 0.1<br> nbnd = 300<br>/<br>&ELECTRONS<br> electron_maxstep = 300<br> mixing_mode = 'local-TF'<br> mixing_beta = 0.3<br>
mixing_ndim = 10<br>/<br>&IONS<br>! ion_dynamics = 'bfgs'<br>/<br>&CELL<br>! cell_dynamics = 'bfgs'<br>! press = 0.0D0<br>! press_conv_thr = 0.1D0<br>
/<br>ATOMIC_SPECIES<br>Al 26.982 Al.pbe-sp-van.UPF<br>ATOMIC_POSITIONS (angstrom)<br>Al 4.295143 -2.479802 43.5<br>Al 5.726858 -3.306403 41.689899<br>Al 1.431714 -0.826601 41.689899<br>Al 2.863429 -3.306403 41.689899<br>
Al 4.295143 -0.826601 41.689899<br>Al 2.863429 -1.653201 39.351919<br>Al 7.158572 -4.133004 39.351919<br>Al 5.726858 -1.653201 39.351919<br>Al 4.295143 -4.133004 39.351919<br>Al 8.590287 -4.959604 37.013940<br>
Al 4.295143 -2.479802 37.013940<br>Al 5.726858 -4.959604 37.013940<br>Al 7.158572 -2.479802 37.013940<br>Al 5.726858 -3.306403 34.675960<br>Al 1.431714 -0.826601 34.675960<br>Al 2.863429 -3.306403 34.675960<br>
Al 4.295143 -0.826601 34.675960<br>Al 2.863429 -1.653201 32.337980<br>Al 7.158572 -4.133004 32.337980<br>Al 5.726858 -1.653201 32.337980<br>Al 4.295143 -4.133004 32.337980<br>K_POINTS (automatic)<br>
6 6 6 0 0 0<br>CELL_PARAMETERS {cubic}<br>10.822192 0.000000 0.000000<br>5.411096 -9.372293 0.000000<br>0.000000 0.000000 139.892407<br>================================<br><br>i change some electrons parameters in order to improve the convergence. I don't know if the enery problem is caused for some special parameter or some like that. but in a paper of Sanchez et al (Molecular Physics, 2004, vol 102, 1045-1055), the energies are aroung 2 to 20 eV.<br>
<br>And the ouput in my case say :<br><br> the Fermi energy is -1.8658 ev<br><br>! total energy = -3357.65873780 Ry ---------------> 2K eV by atom.<br> Harris-Foulkes estimate = -3357.65873669 Ry<br>
estimated scf accuracy < 0.00000057 Ry<br><br> The total energy is the sum of the following terms:<br><br> one-electron contribution = -110140.98098627 Ry<br> hartree contribution = 54852.05508820 Ry<br>
xc contribution = -409.97773145 Ry<br> ewald contribution = 52341.24991020 Ry<br> smearing contrib. (-TS) = -0.00501849 Ry<br><br> total magnetization = 0.00 Bohr mag/cell<br>
absolute magnetization = 0.00 Bohr mag/cell<br><br> convergence has been achieved in 34 iterations<br><br><br>Any help i really appreciate it.<br><br>Best Regards<br>Joaquin Peralta<br>Iowa State University.<br clear="all">
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Joaquín Andrés Peralta Camposano<br>----------------------------------------------------<br><a href="http://www.lpmd.cl/jperalta" target="_blank">http://www.lpmd.cl/jperalta</a><br><br>In a world without frontiers, <br>who needs Gates and Win.<br>