Structural and Magnetic Characterizations of Ruddlesden\u2013Popper Family (Ca2-xNdxMnO4) Compound Synthesized by Ceramic Route

H Issaoui,E Dhahri,F Issaoui,E K Hlil

doi:10.1007/s10909-021-02566-y

Abstract

In this work, we were interested in the Ca2−xNdxMnO4 compounds when (0.1 ≤ x ≤ 0.4). These oxides are synthesized through the solid-state method. In this study, we investigated the evolution of the structure, the magnetic properties and the Mn3+/Mn4+ ratio with the Nd content. The morphological study shows a decrease in the size of the grain in relation to x. The X-ray diffraction reveals a transition from the tetragonal phase to the orthorhombic phase when x = 0.4. Magnetic measurements have been taken for all the compounds in the temperature range between 2 and 300 K. The temperature-dependent magnetic susceptibility shows the presence of three transitions TN, TC and TCO. A dramatic difference in magnetic susceptibility between ZFC and FC was observed below the Neel temperatures for Ca2-xNdxMnO4, which shows the onset of a ferromagnetic moment below these temperatures. This moment is caused by the Dzyaloshinskii–Moriya interaction.

Highlights

The interest in materials with a perovskite structure is explained by their potential technological applications arising from their various and interesting physical properties [1,2,3]
We found that when x increases, for x < 0.3, we have a tetragonal structure and for x > 0.3 an orthorhombic system
The magnetic measurement shows that the Curie temperature TC increases with an increasing concentration of Nd doping

Summary

Introduction

The interest in materials with a perovskite structure is explained by their potential technological applications arising from their various and interesting physical properties [1,2,3]. The Ca2MnO4 has a layered perovskite structure. It does not have an ideal Ruddlesden–Popper-type structure, i.e., the octahedra M nO6 of the compound rotate slightly around the c axis from an ideal Ruddlesden–Popper-type structure with the space group I/4mmm. As a result, it takes a tetragonal unit cell with the space group I41/ acd, a=.

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