A combined study on structural, magnetic and specific heat on double perovskite iridates Ln₂CoIrO₆ [Ln = Pr, Nd]

Abstract

We report a rich magnetic behavior for Co-Ir based double perovskite consisting of different rare earth cations Pr and Nd:- Pr2CoIrO6 (PCIO) and Nd2CoIrO6 (NCIO). Both oxides show an antisite disorder of 10% and a ferrimagnetic transition, TFiM around 96 K and 98 K respectively. The long range magnetic ordering is arising from the canted antiferromagnetic ordering between the Co2+ and Ir4+ ions. A prominent peak around 27 K in magnetization data of NCIO indicates that the total moment of Nd ion is antiferromagnetically coupled to the Co-Ir sublattice. The long range order of the Nd sublattice is corroborated by the evidence of an anomaly in specific heat at very low temperature. The compounds exhibit a maximum change of magnetic entropy of 0.57 (0.48) J/kg-K at TFiM in a magnetic field of 5 T. The strong spin-orbit coupling in 5d states of Ir and cation disorder lead to the Mott insulating phase as found from the analysis of temperature dependent resistivity. These unique behaviors suggest an interesting interplay between localized Nd (Pr)-4f, itinerant Co-3d and Ir-5d electrons.

Enhancing Trifunctional Electrocatalytic Activities via Lanthanide Modulation in Fe–Co-Based Double Perovskite Oxides

“…The X-ray diffraction (XRD) pattern and crystal structure for all the compositions are depicted in Figure , and the perovskite phase formation is confirmed through Rietveld analysis. Generally, the XRD peak at 2θ = 20° is associated with the ordering of Co and Fe in the system . However, the intensity of this peak is notably weak and screened by the background level in comparison to the more prominent peak at 2θ = 33°.…”

“…Generally, the XRD peak at 2θ = 20°is associated with the ordering of Co and Fe in the system. 38 However, the intensity of this peak is notably weak and screened by the background level in comparison to the more prominent peak at 2θ = 33°. The similar atomic absorption coefficient of the Co (∼3240) and Fe (∼2860) elements for the Cu−K α source leads to this weak nature.…”