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Tuning Magnetoconductivity in LaMnO3 NPs through Cationic Vacancy Control

Tuning Magnetoconductivity in LaMnO3 NPs through Cationic Vacancy Control

Authors :
Antonio Hernando
M. Luisa Ruiz-González
Omar Diaz
José M. Alonso
José L. Martínez
Andrés Ayuela
José M. González-Calbet
Raquel Cortés-Gil
Source :
Nanomaterials, Vol 13, Iss 10, p 1601 (2023)
Publication Year :
2023
Publisher :
MDPI AG, 2023.

Abstract

The inclusion of La-Mn vacancies in LaMnO3 nanoparticles leads to a noticeable change in conductivity behavior. The sample retains its overall insulator characteristic, with a typical thermal activation mechanism at high temperatures, but it presents high magnetoconductivity below 200 K. The activation energy decreases linearly with the square of the reduced magnetization and vanishes when the sample is magnetized at saturation. Therefore, it turns out that electron hopping between Mn3+ and Mn4+ largely contributes to the conductivity below the Curie temperature. The influence of the applied magnetic field on conductivity also supports the hypothesis of hopping contribution, and the electric behavior can be explained as being due to an increase in the hopping probability via spin alignment.

Details

Language :
English
ISSN :
20794991
Volume :
13
Issue :
10
Database :
Directory of Open Access Journals
Journal :
Nanomaterials
Publication Type :
Academic Journal
Accession number :
edsdoj.272d0a679ae54f74a669e6fa5d172819
Document Type :
article
Full Text :
https://doi.org/10.3390/nano13101601