Issue 18, 2024

Investigation on the structural, magnetic, magnetocaloric and magnetotransport behaviour of La0.7Sr0.3MnO3 manganites synthesised by different routes

Abstract

In the present investigation, we present the comparison of the structural, magnetic, magnetocaloric and magnetoresistance behavior of solid state and sol–gel derived La0.7Sr0.3MnO3. X-ray diffraction together with Rietveld refinement confirms the rhombohedral structure of the synthesised samples with the R[3 with combining macron]c space group. The ferromagnetic-to-paramagnetic transition temperature decreases from 360 K to 346 K for the nanocrystalline sample. The XPS measurements confirm the presence of Mn3+ in the synthesised samples. Furthermore, the polycrystalline sample exhibits a considerable −ΔSM of 4.68 J kg−1 K−1 at 360 K for a field change of 50 kOe and a relative cooling power (RCP) of 205 J kg−1. A −ΔSM of 1.14 J kg−1 K−1 was obtained for the nanocrystalline sample at 346 K with an RCP of 83 J kg−1. Critical exponent analysis has also been performed on both samples to establish the universality class. Both samples exhibit a distinct metal-to-insulator transition, which increases with grain size from 187 K to 334 K as a result of grain growth and decreased grain boundary. As the grain size increases, the resistivity decreases and shifts towards high temperatures with increasing magnetic fields. The itinerant electron model (IEO) which is based on the hopping of O 2p itinerant electrons has been used to explain the resistivity behaviour of the samples. It is found that the negative magnetoresistance also increases with a decrease in grain size where the highest %MR of 26% can be observed for the nanocrystalline sample. These results make La0.7Sr0.3MnO3 a suitable candidate for multifunctional applications.

Graphical abstract: Investigation on the structural, magnetic, magnetocaloric and magnetotransport behaviour of La0.7Sr0.3MnO3 manganites synthesised by different routes

Supplementary files

Article information

Article type
Paper
Submitted
15 Nov 2023
Accepted
13 Apr 2024
First published
24 Apr 2024

Phys. Chem. Chem. Phys., 2024,26, 13773-13789

Investigation on the structural, magnetic, magnetocaloric and magnetotransport behaviour of La0.7Sr0.3MnO3 manganites synthesised by different routes

B. Uthaman, V. R. Akshay and M. R. Varma, Phys. Chem. Chem. Phys., 2024, 26, 13773 DOI: 10.1039/D3CP05554J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements