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Fully relativistic pseudopotentials

Fully relativistic pseudopotentials generated by
the MBK (PRB 47, 6728 (1993)) scheme within LDA (CA19) and GGA (PBE19) which contain
a partial core correction and fully relativistic effects including spin-orbit coupling.

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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 ADPACK, and
never optimized by OpenMX.
Since Rb_CA19.vps and Rb_PBE19.vps include the 4s, 5p, and 5s states (9 electrons)
as the valence states, the minimal basis set is Rb*.*-s2p1.
Our recommendation for the choice of cutoff radius of basis functions is that
Rb11.0.pao is enough for bulks, but Rb13.0.pao or Rb15.0.pao is preferable
for molecular systems.

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Benchmark calculations by the PBE19 pseudopotential with the various basis functions

**(1) Calculation of the total energy as a function of lattice constant in the bcc structure,**
where the total energy is plotted relative to the minimum energy for each case. a_{0}
and B_{0} are the equilibrium lattice constant and bulk modulus obtained by fitting to
the Murnaghan equation of state. The difference between Rb11.0-s3p3d2f2 and Rb11.0-s4p3d3f2
in the total energy at the minimum point is 0.0066 eV/atom.
An input file used for the OpenMX calculations can be found at
Rbbcc-EvsV.dat.
For comparison the result by the Wien2k code is also shown, where
the calculation was performed by default setting in the Ver. 9.1 of Wien2k except for
the use of R_{MT} x K_{MAX} of 12.

**(2) Calculations of the band dispersion in the bcc structure,**
where the non-spin polarized collinear calculation with the lattice constant of 3.150 Ang.
was performed using Rb_PBE19.vps and Rb11.0-s3p3d2f2,
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
Rbbcc-Band.dat.
For comparison the result by the Wien2k code is also shown, where
the calculation was performed by default setting in the Ver. 9.1 of Wien2k
except for the use of R_{MT} x K_{MAX} of 12.