  A two-dimensional scandium monochloride sheet was investigated by using
density functional theory. It could be exfoliated from a known bulk material
with a cleavage energy slightly lower than that of graphene. The sheet has a
ferromagnetic ground state with a Curie temperature of 100 K. Moreover, the
sheet becomes a half-metal under hole doping. The Curie temperature increases
to 250 K with the doping amount of 0.4 per primitive cell, which is close to
the ice point. The two-dimensional scandium monochloride sheet should be a good
candidate for two-dimensional spintronics.
