Magnetic, Magnetocaloric, and Critical Exponent Properties of Layered Perovskite La1.1Bi0.3Sr1.6Mn2O7Prepared by Coprecipitation Method

The objective of the present work is to investigate the critical behavior and the magnetocaloric performance of the La(1.1)Bi(0.3)Sr(1.6)Mn(2)O(7)double-layered perovskite, prepared by coprecipitation method, around the ferromagnetic (FM)-paramagnetic (PM) phase transition. Using Landau formalism, we have confirmed that the magnetic transition nature is of second-order with a Curie temperature of 340 K. The magnetic entropy values (- increment S-M) estimated by Landau theory are in conformity with those obtained using the classical Maxwell relation. The critical exponents have been obtained using various techniques such as modified Arrott plots (MAP), Kouvel-Fisher (KF), critical isotherm analysis (CIA), and Windom scaling relation (WSR).beta,gamma, and delta are close to the theoretical prediction of the mean-field model, indicating that the magnetic interactions are of a long range. Besides, an independent analysis of the critical behavior is presented in terms of the magnetocaloric effect supporting the validity of the mean-field approach.