THERMAL SCIENCE

International Scientific Journal

Zainab M.h El-Qahtani

,

Alaa M. Adam

,

Ahmed Elshafaie

,

Eslam M.m Ibrahim

,

Ahmet Mohamed Ahmed

,

Hanadi Abdelsalam

,

Ibtisam Daqqa

,

Khalda T. Osman

STRUCTURAL AND MAGNETIC PROPERTIES OF NANOPARTICLE SEMICONDUCTORS LA1-XSRXMNO3

ABSTRACT
With a view to investigate the magneto-structural properties and influence of an­nealing on magnetoresistance of strontium-doped lanthanum manganite, samples of La1-xSrxMnO3 were prepared and their magneto-transport properties have been investigated in this article. Magnetoresistance is enhanced from 6% to about 94% at room temperature due to annealing. Resistivity and Seebeck coefficient were investi­gated over the temperature range 83 ≤ T ≤ 313 K. The quasi-static magnetization was investigated in the temperature range of 5-400 K under effect of a magnetic field of 100 Oe in both moods of field cooling presence besides the zero field cooling. The measurements of magnetization showed Curie transition from ferromagnetic be­havior to paramagnetic one. The Curie transition values increased with increasing the strontium content suggesting that the transfer integral between two Mn sites would be enhanced due to the substitution of smaller La ions (117.2 pm) by great­er Sr ions (132 pm). Various parameters were calculated from the application of variable range hopping and single polaron hopping models. Both models were utilized to investigate the effect of Sr on the conduction behavior. The behavior of thermopower with temperature was demonstrated on the basis scatterings of phonon-and magnon-.
KEYWORDS
magnetoresistance, Curie transition, ferromagnetic region, polaron hopping, magnon-scattering
PAPER SUBMITTED: 2024-08-24
PAPER REVISED: 2024-10-27
PAPER ACCEPTED: 2024-11-19
PUBLISHED ONLINE: 2025-02-22
DOI REFERENCE: https://doi.org/10.2298/TSCI2501383E
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2025, VOLUME 29, ISSUE Issue 1, PAGES [383 - 394]
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Structural and magnetic properties of nanoparticle semiconductors La1-xSrxMnO3

2025 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence