  Electronic and magnetic properties of the fcc Americium (001) surface have
been investigated via full-potential all-electron density-functional electronic
structure calculations at both scalar and fully relativistic levels. Effects of
various theoretical approximations on the fcc Am (001) surface properties have
been thoroughly examined. The ground state of fcc Am (001) surface is found to
be anti-ferromagnetic with spin-orbit coupling included (AFM-SO). At the ground
state, the magnetic moment of fcc Am (001) surface is predicted to be zero. Our
current study predicts the semi-infinite surface energy and the work function
for fcc Am (001) surface at the ground state to be approximately 0.82 J/m2 and
2.93 eV respectively. In addition, the quantum size effects of surface energy
and work function on the fcc Am (001) surface have been examined up to 7 layers
at various theoretical levels. Results indicate that a three layer film surface
model may be sufficient for future atomic and molecular adsorption studies on
the fcc Am (001) surface, if the primary quantity of interest is the
chemisorption energy.
