incommensurate superstructure

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ANNNI model — The abbreviation ANNNI model stands for Axial Next Nearest Neighbor Ising model . It is a highly cited variant of one of the best known models in statistical physics, the Ising model. In that variant, competing ferromagnetic and antiferromagnetic … Wikipedia
Spin density wave — (SDW) and charge density wave (CDW) are names for two similar low energy ordered states of solids. Both these states occur at low temperature in anisotropic, low dimensional materials or in metals that have high densities of states at the Fermi… … Wikipedia

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