  The ground state and thermodynamic properties of an asymmetric diamond
Ising--Hubbard chain with the on-site electron-electron attraction has been
considered. The problem can be solved exactly using the decoration-iteration
transformation. In the case of the antiferromagnetic Ising interaction, the
influence of this attraction on the ground state and the temperature
dependences of the magnetization, magnetic susceptibility, and specific heat
has been studied.
