Fully relativistic pseudopotentials
Fully relativistic pseudopotentials generated by
the MBK (PRB 47, 6728 (1993)) scheme within LDA (CA13) and GGA (PBE13) which contain
a partial core correction and fully relativistic effects including spin-orbit coupling.
Pseudo-atomic orbitals
The number below the symbol means a cutoff radius (a.u.) of the confinement
potential. These file includes fifteen radial parts for each angular
momentum quantum number l (=0,1,2,3). The basis functions were generated by variationally
optimizing the corresponding primitive basis functions in the single atom.
The input files used for the orbital optimization can be found at
Sb_opt.dat .
Since Sb_CA13.vps and Sb_PBE13.vps include the 4d, 5s, and 5p states (15 electrons)
as the valence states, the minimal basis set is Sb*.*-s1p1d1.
Our recommendation for the choice of cutoff radius of basis functions is that
Sb7.0.pao is enough for bulks, but Sb9.0.pao or Sb11.0.pao is preferable
for molecular systems.
Benchmark calculations by the PBE13 pseudopotential with the various basis functions
(1) Calculation of the total energy as a function of lattice constant in the fcc structure,
where the total energy is plotted relative to the minimum energy for each case. a0
and B0 are the equilibrium lattice constant and bulk modulus obtained by fitting to
the Murnaghan equation of state. The difference between Sb7.0-s3p3d3f2 and Sb7.0-s4p4d3f2
in the total energy at the minimum point is 0.0033 eV/atom.
An input file used for the OpenMX calculations can be found at
Sbfcc-EvsV.dat .
For comparison the result by the Wien2k code is also shown, where
the calculation was performed by default setting in the Ver. 10.1 of Wien2k except for
the use of RMT x KMAX of 12.
(2) Calculations of the band dispersion in the fcc structure,
where the non-spin polarized collinear calculation with the lattice constant of 4.79 Ang.
was performed using Sb_PBE13.vps and Sb7.0-s3p3d3f2 and the origin of the energy
is taken to be the Fermi level.
The input file used for the OpenMX calculations can be found at
Sbfcc-Band.dat .
For comparison the result by the Wien2k code is also shown, where
the calculation was performed by default setting in the Ver. 10.1 of Wien2k
except for the use of RMT x KMAX of 12.
