Ferromagnetic Coupling in Quasi-One-Dimensional Hybrid Iron Chloride Hexagonal Perovskites

Abstract

We synthesize four novel quasi-one-dimensional organic− inorganic hybrid iron chloride compounds (CH 3 NH 3 FeCl 3 , CH-(NH 2 ) 2 FeCl 3 , C(NH 2 ) 3 FeCl 3 , and C 3 H 5 N 2 FeCl 3 ) and characterize their structural and magnetic properties. These materials crystallize in a hexagonal perovskite-type structure, constituting a triangular array of face-sharing iron chloride octahedra chains running along the c-axis, isolated from one another by the organic cation. Through magnetization and heat capacity measurements, we find that the intrachain coupling is weakly ferromagnetic for each variant. Importantly, this work underscores the utility of solid-state chemistry approaches in synthesizing new organic−inorganic hybrid materials.

Solid-State Synthesis Route to a Hybrid Cobalt Chloride Perovskite Ferroelectric

“…To put the observed magnetic properties of these materials into context, comparisons can be made with our previous analyses of the ACoCl3 and AFeCl3 families. 15,16 Like the MA, FA, and (as opposed to the average), the trend is upheld. This suggests that perhaps 3D magnetic ordering in these materials is initiated by shorter-range interactions between adjacent chains possessing the smallest Co-Co distances.…”

“…34,[37][38][39][40][41] The broad hump below 10 K for (3-pyrrolinium)FeCl3 (inset) likely indicates short-range interactions, either between or within chains, and is similar to broad features observed at low temperature in analogous AFeCl3 compounds. 16 There is no evidence of long-range magnetic ordering observed for the Fe material between 0.7 and 200 K.…”

“…[9][10][11][12][13] We have studied several such systems-namely the AMCl3 (M = Ni 2+ , Co 2+ , Fe 2+ ) families of materials. [14][15][16] More specifically, our work focused on characterizing the nature of the one-dimensional magnetic correlations in hybrid Ni, Co, and Fe chloride hexagonal perovskites. We found that the resulting intrachain magnetic correlations are dependent on the identity of the organic cation in addition to that of the magnetic ion.…”