Preparation, magnetic and Mössbauer resonance investigation of some perovskite-type oxides containing iridium +V

Crystal and Magnetic Structure of Sr2MIrO6 (M = Ca, Mg) Double Perovskites – A Neutron Diffraction Study

“…As the effective magnetic moment of Ir 6+ ions, experimentally obtained, is rather close to the spin‐only value ( S = 3/2 μ cal = 3.87 μ B ) in Sr 2 CaIrO 6 , the spin–orbit coupling characteristic of the 5d metal transition is then not observed on the Ir 6+ magnetic moment value. In Sr 2 MgIrO 6 , the discrepancy between the experimental and the calculated magnetic moment values is larger, and the reduced moment suggests the presence of Ir 5+ ions (this ion has been described as nonmagnetic in previous work)1,15–18 or perhaps the presence of short‐range correlations in the high‐temperature region in which the Curie–Weiss law has been applied.…”

Crystal Structure, Phase Transitions, and Magnetic Properties of Iridium Perovskites Sr2MIrO6 (M = Ni, Zn)

“…As shown in the inset of Figure 7, for M = Ni the reciprocal susceptibility data do not obey the Curie−Weiss Law above T N , which is probably due to the dependence of the effective moment of Ir 5+ with temperature, depending on the degree of spin−orbit coupling. 18,34 For M = Zn, the linear fit gives a value of the experimental paramagnetic moment of μ eff = 3.82 μ B with a negative values of Weiss temperature (−430 K), suggesting the presence of antiferromagnetic interactions in this compound.…”

The crystal growth and magnetic properties of Ln2LiIrO6 (Ln=La, Pr, Nd, Sm, Eu)

“…It is known that Ir(V) has a nonmagnetic ground state and, therefore, at low temperatures contributes very little to the magnetic susceptibilities [9,10,23] of Pr 2 LiIrO 6 , Nd 2 LiIrO 6 , Sm 2 LiIrO 6 , and Eu 2 LiIrO 6 , which are dominated by the magnetism of the rare earth cations. At higher temperatures, however, the Ir(V) species does contribute to the susceptibility, which is not negligible for Eu 2 LiIrO 6 and important for Sm 2 LiIrO 6 .…”