Magnetic and magnetocaloric properties of LaBiSrCoO and their implementation in critical behaviour study and spontaneous magnetization estimation.

In this work, we present the results of the magnetic, critical, and magnetocaloric properties of the rhombohedral-structured LaBiSrCoO cobaltite. Based on the modified Arrott plot, Kouvel-Fisher, and critical isotherm analyses, we obtained the values of critical exponents (, , and ) as well as Curie temperature ( ) for the investigated compound. These components were consistent with their corresponding values and they were validated by the Widom scaling law and scaling theory. The obtained critical exponents were close to the theoretical prediction of the mean-field model values, revealing the characteristic of long-range ferromagnetic interactions. The magnetic entropy, heat capacity, and local exponent (, ) of the LaBiSrCoO compound collapsed to a single universal curve, confirming its universal behaviour. The estimated spontaneous magnetization value extracted through the analysis of the magnetic entropy change was consistent with that deduced through the classical extrapolation of the Arrott curves. Thus, the magnetic entropy change is a valid and useful approach to estimate the spontaneous magnetization of LaBiSrCoO.