Theoretical investigations on the magnetocaloric and electrical properties of a perovskite manganite La0.67Ba0.1Ca0.23MnO3

Abstract

An investigation of the magnetic, magnetocaloric and electrical behavior of La0.67Ba0.1Ca0.23MnO3 is presented. The variation of magnetization (M) vs. temperature (T) under 1, 2, 3, 4 and 5 T magnetic fields reveals a ferromagnetic-paramagnetic transition. Magnetic entropy change, relative cooling power and specific heat for magnetic field variation were conducted using a phenomenological model. Moreover, the electrical resistivity is fitted with the phenomenological percolation model which is based on the phase segregation of ferromagnetic metallic clusters and paramagnetic insulating regions. The equation of the form ΔSMP(T,H) = -α∫0H[∂ ln ρ/∂T]H dH relates the magnetic order to the transport behavior of our sample. The results show that the as obtained magnetic entropy change values are similar to those determined using data obtained from the investigation of the dependence of magnetization on the temperature and magnetic field.