Evolution of magnetic ordering under pressure in low-dimensional pseudohalides
Molecular framework materials have attracted much recent attention due to their extreme responses to stimuli and the ability to design structure. In contrast to conventional (oxide, halide) frameworks, by choosing metals and linkers, we can effectively target specific structures and therefore functionality. One challenge in harnessing this tunability to design e.g. future device materials, is that molecular linkers do not facilitate strong magnetic interactions. Here we propose the systematic investigation of the thiocyanate-based molecular framework, namely nickel (II) thiocyanate, Ni(NCS)2. Unlike other molecular frameworks, thiocyanate has been shown to be able to facilitate strong magnetic coupling (|TCW| > 100 K; Ni(NCS)2 TN = 54 K) while retaining flexibility not found in the analogous halide frameworks. We have found a dramatic increase in TN for this framework under hydrostatic pressure. To understand this magnetoelastic coupling, we will measure the magnetic ground state at low temperature and high pressure, and the evolution of the magnetic and nuclear structure on heating at high pressure.
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Matthew J. Cliffe; CAIRNS Andrew; Caņadillas-Delgado, L.; Claire V. Colin; FABELO ROSA Oscar Ramon; GEERS Madeleine; NASSIF Vivian and PUENTE ORENCH Ines. (2021). Evolution of magnetic ordering under pressure in low-dimensional pseudohalides. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-24-660
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