Determining the magnetic structures of the Cr-based antiperovskites Cr3BN (B = Ge and As)
Antiperovskites, A3BX, have received only a small fraction of interest compared to conventional perovskites, ABX3, however it is now being realised that they also display similarly diverse properties whilst maintaining the chemical flexibility of their better-known counterparts. One of the most studied antiperovskite families are those with Mn on the A-site. These materials have attracted a resurgence of interest due to the functional properties they display, such as caloric effects and anomalous thermal expansion, as a result of strong coupling between the magnetic and crystal structures. Materials with Cr on the A-site are far less studied and are largely expected to remain Pauli paramagnetic at all temperatures. However, recent experiments on Cr3BN (B = Ge and As) have suggested the emergence of long-range magnetic order and unusual structural distortions. We propose to use D20 to determine the magnetic structure in Cr3GeN and Cr3AsN across the structural transitions. By exploring novel phase transitions in antiperovskites we hope to expand the library of their structural and magnetic flexibilities in order to guide the synthetic design of functional materials.
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BOLDRIN David; CONNOLLY Eamonn and Thomas C. Hansen. (2021). Determining the magnetic structures of the Cr-based antiperovskites Cr3BN (B = Ge and As). Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2841
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