J. Phys A 30, L711-L717 (1997).

A complete devil s staircase in the Falicov Kimball model

C Micheletti, A B Harris and J M Yeomans

Link to online article.
We consider the neutral, one-dimensional Falicov Kimball model at zero temperature in the limit of a large electron ion attractive potential, U. By calculating the general n-ion interaction terms to leading order in 1/U we argue that the ground state of the model exhibits the behaviour of a complete devil's staircase.