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Ground‐state and finite‐temperature behaviour of the mixed spin‐1/2 and spin‐1 Ising–Heisenberg model on decorated planar lattices consisting of inter‐connected diamonds is investigated by means of the generalised decoration–iteration mapping transformation. The obtained exact results clearly point out that this model has a rather complex ground state composed of two unusual quantum phases, which is valid regardless of the lattice topology as well as the spatial dimensionality of the investigated system. It is shown that the diamond‐like decorated planar lattices with a sufficiently high coordination number may exhibit a striking critical behaviour including reentrant phase transitions with two or three consecutive critical points.

Reentrant phenomenon in the exactly solvable mixed spin‐1/2 and spin‐1 Ising–Heisenberg model on diamond‐like decorated planar lattices