  The ground-state properties of iron-group transition metals from Sc to Cu
have been investigated on the basis of the first-principles momentum dependent
local ansatz (MLA) theory. Correlation energy gain is found to show large
values for Mn and Fe: 0.090 Ry (Mn) and 0.094 Ry (Fe). The Hund-rule coupling
energies are found to be 3000 K (Fe), 1400 K (Co), and 300 K (Ni). It is
sugested that these values can resolve the inconsistency in magnetic energy
between the density functional theory and the first-principles dynamical
coherent potential approximation theory at finite temperatures. Charge
fluctuations are shown to be suppressed by the intra-orbital correlations and
inter-orbital charge-charge correlations, so that they show nearly constant
values from V to Fe: 1.57 (V and Cr), 1.52 (Mn), and 1.44 (Fe), which are
roughly twice as large as those obtained by the $d$ band model. The amplitudes
of local moments are enhanced by the intra-orbital and inter-orbital spin-spin
correlations and show large values for Mn and Fe: 2.87 (Mn) and 2.58 (Fe).
These values are in good agreement with the experimental values estimated from
the effective Bohr magneton number and the inner core photoemission data.
