  We study the possibility of baryogenesis in the case of supersymmetry
breaking with large mixing between the right-handed scalar charm and
right-handed scalar top or right-handed scalar up and right-handed scalar top
squarks resulting in one light right-handed up-type squark mass eigenstate. We
argue that in this case the electroweak phase transition will be first order,
and that large phases already present in the quark mass matrices can generate a
baryon asymmetry of the correct magnitude without introducing any new phases
specifically for this purpose. We study in detail a particular ansatz for
supersymmetry breaking and CP violation where there is only one CP violating
phase in the theory: in the up-type quark mass matrix. We study the constraints
placed on this model by baryogenesis and flavor physics. This scenario has
robust implications for low energy flavor phsyics including D-Dbar mixing and
an electric dipole moment for the neutron that are close to the experimental
bounds, and CP violation in the B-Bbar system that is different from that in
the Standard Model.
