Transport-magnetism correlation in layered perovskite manganite LaCaBiMn2O7. (15th July 2022) - Ounza, Y.
Abstract: An investigation was conducted to understand the electrical behavior of the double-layered perovskite LaCaBiMn2 O7 at temperatures varying from 2 to 400 K under a magnetic field range 0–5 T. At metal-insulator peak temperature ( T MI ), the data reveal a metal-insulator transition. The compound exhibits a strong magnetoresistance (MR) effect (∼55%) around T MI at a field of 5 T, while the highest value of temperature coefficient of resistance (TCR) is 0.89% K −1 was found at zero-field. In order to analyze the electrical behavior as well as the magnetic properties, a simulation was established with the resistivity ( ρ) data using a mathematical model based on the percolation theory. The mutual relationship between transport properties and magnetic behavior has been exploited to predict the magnetic entropy change by analysis of ρ(H, T), It is demonstrated that the magnetic entropy change acquired from ρ(H, T) data is in accordance with those determined by magnetization measurements. Highlights: Double layered perovskite LaCaBiMn2 O7 was prepared by coprecipitation method. The LaCaBiMn2 O7 exhibits a metal-insulator transition at TMI . The resistivity ( ρ) data were well fitted with the phenomenological percolation model around TMI . The magnetic entropy change values acquired from M(H, T) and ρ(H, T) are similar.