Crystal and magnetic structures of the fcc iridate (NH4)2IrCl6: A candidate j_eff=1/2 Mott insulator
We propose to study the crystal and magnetic structures of the iridate (NH4)2IrCl6 single-crystal in which Ir4+ magnetic ions are arranged on a geometrically frustrated face-centered-cubic lattice. Further, Ir4+ possesses ideal j_eff=1/2 single-ion state due the cubic-crystalline electric field produced by the regular Cl6 octahedra down to at least 10 K. Neutron diffraction technique will be used to determine the crystal structure at very low temperature to check the local cubic environment of the Ir and whether the magnetism in this compound is governed by the interactions between ideal j_eff=1/2 moments. The non-trivial exchange interactions between these j_eff=1/2 moments on the ideal fcc lattice have been predicted to host rich magnetic phases by theoretical studies. In this context, the magnetic reflections will be searched for at commensurate positions typical for the type-I (q=[1 0 0]) and type-III (q=[1 0.5 0]) states. D10 with its high-flux neutron beam and low intrinsic background makes it viable to perform this challenging experiment due to technical difficulties associated with neutron absorption by Ir and incoherent scattering by hydrogen.
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KHAN Nazir; BEAUVOIS Ketty; OULADDIAF Bachir and TSIRLIN Alexander. (2020). Crystal and magnetic structures of the fcc iridate (NH4)2IrCl6: A candidate j_eff=1/2 Mott insulator. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-41-1068
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