Eur. Phys. J. Plus (2022) 137: 406
https://doi.org/10.1140/epjp/s13360-022-02640-8

Regular Article

Investigation of the dielectric response and the transport properties of samarium and strontium-based manganite

¹ Unité de Recherche Matériaux Avancés et Nanotechnologies (URMAN), Institut Supérieur des Sciences Appliquées et de Technologie de Kasserine, Université de Kairouan, BP 471, 1200, Kasserine, Tunisia
² Laboratoire de Physique des Matériaux et des Nanomatériaux Appliquée à l’Environnement, Faculté des Sciences de Gabès, Université de Gabes, Cité Erriadh, 6079, Gabès, Tunisia

^a moualhiyoussef7@gmail.com

Received: 9 October 2021
Accepted: 22 March 2022
Published online: 30 March 2022

Abstract

Electrical and dielectric properties of the Sm_0.45Pr_0.1Sr_0.45MnO₃ compound are presented within the wide frequency and temperature ranges. Dielectric analysis proved the polar dielectric behavior of the studied compound. In addition, it confirms the colossal dielectric response of the elaborated system. Conductivity measurements and some theoretical models are employed to conduct the transport properties study. The direct current conductivity shows a metal–semiconductor transition at around 140 K. At higher temperatures, the conduction phenomenon is explained according to the small polaron hopping mechanism. At lower temperatures and beyond 140 K, the variable range hopping is considered as the appropriate process to explain the semiconductor behavior of the studied manganite. The alternative current conductivity is discussed in the framework of Bruce and Jonscher’s models. The non-overlapping small polaron tunneling, the correlated barrier hopping, and the overlapping large polaron tunneling mechanisms are proposed to investigate the transport properties in the dynamic region. The validity of the time–temperature superposition principle is verified in the temperature range [220–380 K]. Moreover, deviation from the Summerfield scaling model is observed over the explored temperature interval. Below T_t = 248 K, a fraction of the mobile oxide ions appears to be blocked at impermeable parts of the internal surfaces.