Field-induced behavior of (NH4)2IrCl6 with the near ideal j_eff = 1/2 state of Ir4+
(NH4)2IrCl6 offers the best possible cubic condition to realize the novel j_eff=1/2 state of Ir4+ down to a very low temperature. The interplay of the geometric frustration and the exchange frustration due to the bond dependent Kitaev interactions on the fcc lattice results in type-IIIA (k=1 0.5 0) collinear antiferromagnetic (AFM) ground state. Its ground state is one of the rich magnetic phases proposed by the fcc Heisenberg-Kitaev (J1-J2-K) model and it appears to lie close to the phase boundary. Therefore, its magnetic ground state could be tuned by external stimuli quite easily. In fact, a preliminary study on isostructural K2IrCl6 compound suggested that in the high-field phase the AFM state is a non-linear combination of both type-I, k = (1 0 0) and type-IIIA, k = (1 0.5 0) magnetic structures. Secondly, a strong volume effect has been observed just below the magnetic transition from thermal expansion measurement, suggesting spin-lattice coupling also playing a role in the magnetic ordering phenomena. Thus (NH4)2IrCl6 may act as a unique case of an ideal j_eff= 1/2 system and a 5d frustrated AFM with the strong spin-lattice coupling and deserves a detailed investigation.
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KHAN Nazir; OULADDIAF Bachir and TSIRLIN Alexander. (2021). Field-induced behavior of (NH4)2IrCl6 with the near ideal j_eff = 1/2 state of Ir4+. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-41-1132
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