Abstract
Abstract Square lattice phase diagrams are investigated with the extended Ising model, considering pair and triplet interactions. We determine the stability of the c(2×2) structure as a function of different triplet interactions. A systematical study of the asymmetry of the phase diagram shows that the triplet interactions with two nnn bounds play a major role in producing an asymmetric phase diagram. The experimental phase diagram of hydrogen adsorbed on a Pd (001) surface is discussed within this framework.
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