Transport-magnetism correlation in layered perovskite manganite LaCaBiMn2O7

An investigation was conducted to understand the electrical behavior of the double-layered perovskite LaCa-BiMn2O7 at temperatures varying from 2 to 400 K under a magnetic field range 0-5 T. At metal-insulator peak temperature (TMI), the data reveal a metal-insulator transition. The compound exhibits a strong magnetoresistance (MR) effect (~55%) around TMI 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 (rho) 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 rho(H, T), It is demonstrated that the magnetic entropy change acquired from rho(H, T) data is in accordance with those determined by magnetization measurements.

Automated summary

An investigation was conducted on the electrical behavior of the double-layered perovskite LaCa-BiMn2O7 at various temperatures and magnetic fields, revealing a metal-insulator transition and a strong magnetoresistance effect. The relationship between transport properties and magnetic behavior was analyzed using a mathematical model, predicting the magnetic entropy change.