Controlling multiple orderings in metal thiocyanate molecular perovskites A_x{Ni[Bi(SCN)₆]}

Abstract

Metal thiocyanate hybrid perovskites can have multiple simultaneous complex orderings and combining these orderings appropriately can produce non-centrosymmetric structures.

Magnetic order in a metal thiocyanate perovskite-analogue

“…41,42 Like other perovskites, Cr[Bi(SCN) 6 ] has a wide-range of potential chemical possibilities for tuning its magnetic function: not only through substitution of the magnetic Cr, 12 but also of the non-magnetic Bi, 23,24 and the anionic ligand 43 or the inclusion of A-site cations. 44 This, together with the moderate exchange strength found in this material, comparable with the Zeeman splitting accessible through superconducting magnets, suggests that NCS double pervoskites are ideal platforms to engineer the complex, chiral, multi-k magnetic orderings of current interest for their potential use in magnetic computation. 26,45…”

The structural complexity of perovskites

“…Due to the binding mode chemistry of SCN À , AB(SCN) 3 molecular perovskites show large distortions away from the aristotypical cubic ReO 3 -type network as was previously discussed. 49,50 In turn, the volume of the void is significantly decreased, influencing the structures' complexity by restricting the A-site atom count. Notably, for AB(SCN) 3 thiocyanates this effect is large enough to be recognized by a qualitative comparison of its structure compared to other perovskite classes, see Fig.…”

Non-collinear magnetism in the post-perovskite thiocyanate frameworks CsM(NCS)3

“…[24][25][26][27][28] Unlike their atomic analogues, the majority of molecular post-perovskites are stable and synthesisable at ambient pressure. Incorporating molecular components in these frameworks can also allow for novel physical properties, arising from the additional degrees of freedom, including non-linear optics, [29] electric polarisation [30,31] and complex spin textures. [32] Metal dicyanamides, AM(dca) 3 dca = N(CN) -2 , are the best established family of molecular post-perovskites.…”