On the origin of multi-step spin transition behaviour in 1D nanoparticles

Daniel Chiruta (1, 2, 3) , Catalin-Maricel Jureschi (1, 3, 4) , Jorge Linares (2) , Pierre-Richard Dahoo (5) , Yann Garcia (6) , Aurelian Rotaru (1, 3)

1 MANSiD Research Center [Suceava]
2 GEMAC - Groupe d'Etude de la Matière Condensée
3 Faculty of Electrical Engineering and Computer Science [Suceava]
4 LISV - Laboratoire d'Ingénierie des Systèmes de Versailles
5 PLANETO - LATMOS
6 IMCN/MOST Institute of Condensed Matter and Nanosciences, Molecules, Solids, Reactivity

To investigate the spin state switching mechanism in spin crossover (SCO) nanoparticles, a special attention is given to three-step thermally induced SCO behavior in 1D chains. An additional term is included in the standard Ising-like Hamiltonian to account for the border interaction between SCO molecules and its local environment. It is shown that this additional interaction, together with the short range interaction, drives the multi-steps thermal hysteretic behavior in 1D SCO systems. The relation between a polymeric matrix and this particular multi-step SCO phenomenon is discussed accordingly. Finally, the environmental influence on the SCO system’s size is analyzed as well.

Domains: Materials; Condensed Matter [cond-mat]

Daniel Chiruta, Catalin-Maricel Jureschi, Jorge Linares, Pierre-Richard Dahoo, Yann Garcia, et al.. On the origin of multi-step spin transition behaviour in 1D nanoparticles. The European Physical Journal B: Condensed Matter and Complex Systems, 2015, 88 (9), pp.art. 233. ⟨10.1140/epjb/e2015-60340-x⟩. ⟨insu-01203099⟩