  We report tests of various density functionals for ferromagnetic, Fe, Co and
Ni with a focus on characterizing the behavior of the so-called strongly
constrained and appropriately normed (SCAN) functional. It is found that SCAN
is closer in behavior to functionals that yield localized behavior, such as
hybrid functionals, than other semilocal functionals that are tested. The
results are understood in terms of a tendency to differentiate orbitals,
favoring integer occupation, which is necessary for a correct description of
atomic systems, but inappropriate for the open shell metallic ferromagnetic
metals studied here.
