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4Â¥2012-08-12 15:25:00
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CODE:
!BIOSYM archive 3
PBC=ON
Materials Studio Generated CAR File
!DATE Tue Apr 03 11:51:13 2012
PBC    2.4600    2.4600   10.0000   90.0000   90.0000  120.0000 (P1)
C1      -0.000000000    1.420281705    5.000000000 XXXX 1      xx      C   0.000
C2       1.230000037    0.710140852    5.000000000 XXXX 1      xx      C   0.000
end
end

2Â¥2012-08-06 15:42:41
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Determining the groundstate energ of atoms
The POTCAR file contains information on the energy of the atom in the reference configuration (i.e. the configuration for which the PP was generated). Total energies calculated by vasp are with respect to this configuration. The reference calculation, however, did not allow for spin-polarisation or broken symmetry solutions, which usually lower the energy for gradient corrected of hybrid functionals. To include these effects properly, it is required to calculate the lowest energy magnetic groundstate using VASP.

Unfortunately convergence to the symmetry broken spin polarized groundstate can be relatively slow in VASP. The following INCAR file worked reasonably well for most elements:

ISYM = 0      # no symmetry
ISPIN = 2     # allow for spin polarisation
VOSKOWN = 1   # this is important, in particular for GGA
               # but not required for PBE potentials
ISMEAR = 0    # Gaussian smearing, otherwise negative occupancies might come up
SIGMA = 0.002 # tiny smearing width to safely break symmetry
AMIX = 0.2    # mixing set manually
BMIX = 0.0001  
NELM = 100    # often many steps are required
ICHARG = 1

Execute VASP twice to three times, consecutively with this input file until energies are converged. Furthermore, we recommend to use large slightly non-cubic cells, i.e. 12 Å$\times$13 Å$\times$14 Å. In some cases, we also found it advantageously to use direct energy minimization instead of charge-density mixing

ALGO = D ; LSUBROT = .FALSE. ; NELM = 500 ; TIME = 0.2

or

ALGO = A ; LSUBROT = .FALSE. ; NELM = 500 ; TIME = 0.2

Always check for convergence, and whether all occupancies are 0 or 1.
3Â¥2012-08-07 14:39:46
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phon.f
reader.f: drdatab.f
set_lattice.f :  sgama.f  :  cubicsym.f , hexsym.f   
generate_punti.f
build_supercell.f
get_displ.f  
rshell.f :  hpsort.f  
numeric_force.f   : get_wig.f ,  set_forces.f ,sgama1.f
dyn_mat.f
diagonalize.f :  dsyev.f  ,zheev.f
smooth.f

      
simpson.f
                          
MODULE
nrtype.f
nrutil.f  
data.f   

FUNCTION
equiva.f
dlexlib.f


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   !==========================================================================
  ! read in run time variables
  !==========================================================================
  !======================================================================
  ! set lattice
  !=====================================================================
  !---------------------------
  ! Number of phonon branches
  !---------------------------
  !===========================
  ! Build a supercell ?
  !===========================
  !=============================================================================
  ! construct the shell of vectors in real space
  !=============================================================================
  !--------------------------
  ! set the list of vectors
  !--------------------------
  !==========================================================
  ! Write the force constant matrix in the file HARMONIC ?
  !==========================================================
  !==========================================================================
  ! calculate the free energy as the sum of frequencies, you must provide
  ! the file 'QPOINTS' which contains the special points of the BZ
  ! IN RECIPROCAL LATTICE COORDINATES
  !=========================================================================
        !==========================================================================
        ! construct the dynamical matrix
        !==========================================================================
        !==========================================================================
        ! diagonalize the dynamical matrix
        !==========================================================================
        !=====================
        ! density of states
        !=====================
           !==========================================================================
           ! the phonon frequencies are the squares of the matrix eigenvalues
           !==========================================================================
           !-----------------------------------------------------------------------
           ! exclude the acustic mode at gamma and any imaginary frequency
           !-----------------------------------------------------------------------
              !                  stop 'negative eigenvalues'
              !----------------------------------------------------------            
     !------------------------------------------------------------
     ! print out thermodynamic quantities and writes file THERMO
     !------------------------------------------------------------
     !---------------------------------
     ! writes density of states files
     !---------------------------------
  !============================================================================
  ! calculate phonon dispersions, written in files FREQ and FREQ?
  !===========================================================================
        !==========================================================================
        ! construct the dynamical matrix
        !==========================================================================
        !==========================================================================
        ! diagonalize the dynamical matrix
        !==========================================================================
           !==========================================================================
           ! the phonon frequencies are the square roots of the matrix eigenvalues
           !==========================================================================

[ Last edited by uuv2010 on 2012-8-12 at 16:24 ]
5Â¥2012-08-12 16:16:50
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