Structural, electronic and magnetic properties of La$_{1.5}$Ca$_{0.5}$(Co$_{0.5}$Fe$_{0.5}$)IrO$_6$ double perovskite

TL;DR

This study synthesizes and characterizes La$_{1.5}$Ca$_{0.5}$(Co$_{0.5}$Fe$_{0.5}$)IrO$_6$, revealing its monoclinic structure, mixed oxidation states, and ferrimagnetic behavior with high coercivity, relevant for magnetic applications.

Contribution

It provides detailed structural, electronic, and magnetic analysis of a new double perovskite with potential for magnetic applications.

Findings

Monoclinic $P2_{1}/n$ structure confirmed.

Mixed oxidation states of Co, Fe, and Ir identified.

Ferrimagnetic behavior with high coercivity observed.

Abstract

In this work, we report the synthesis and investigation of structural, electronic, and magnetic properties of La$_{1.5}$Ca$_{0.5}$(Co$_{0.5}$Fe$_{0.5}$)IrO$_6$. Our polycrystalline sample forms as a single-phase double perovskite in monoclinic $P2_{1}/n$ space group. Co and Ir are most likely in bivalent and tetravalent oxidation states, respectively, while Mossbauer spectroscopy indicates that Fe is in a trivalent state. The ac and dc magnetization data suggest a ferrimagnetic behavior resulting from the presence of two antiferromagnetic sublattices at Co/Fe and Ir sites. The large coercive field H_C $\simeq$ 32 kOe observed at 10 K, comparable to that of other double perovskites of interest for hard magnets, is discussed in terms of the structural distortion and the spin and orbital magnetic moments of the transition metal ions.