Cooperative spin-crossover-like transitions in the inhomogeneous chain of exchange clusters
Abstract
A statistical theory of temperature-induced spin-crossover-like transitions has been developed for spin chains with a few exchange clusters in a unit cell. Using static magnetic susceptibility measurements, a general expression for the effective magnetic moment μeff of exchange clusters is obtained for an arbitrary structure of cluster terms. For heterospin Cu(hfac)2LR complexes (“breathing crystals”) with a “head-to-head” chain motif, a two-point approximation for a partition function of the Jahn–Teller Cu+2 paramagnetic center (spin 1/2) is suggested. Theoretical results are compared with available