Uniaxial phase of alkali metals on a fcc (100) metal surface

The overlayer phases of alkali metals on a fcc (100) surface are modeled by simple dipole moment interactors on a modulated potential surface. Ground-state configurations are determined, and the criteria are established under which a uniaxial phase can be formed. The effect of lateral variation in the substrate potential on the structure of the uniaxial phase is examined. Scattering profiles are calculated and we show how they are influenced by this substrate corrugation. Domain-wall pinning and thermal influences are also considered.