Critical behavior of La0.87K0.13MnO3 manganite

The heat capacity of La0.87K0.13MnO3 manganite is measured in temperature intervals from 80 to 350 K. A nature of the ferromagnetic phase transition and critical properties of the heat capacity near Curie temperature are studied. The principles of change in universal critical parameters near a phase transition point are determined. The critical exponents and heat capacity amplitude are calculated with account of correction to the scaling α = −0.13, А+/А− = 1.178, and correspond to the critical behavior of 3D Heisenberg model. It is found a critical exponent of the correlation radius υ = 0.71, which is also conform to the Heisenberg universality class.

► A nature of the ferromagnetic phase transition and critical properties of the heat capacity near Curie temperature are studied.
► The principles of change in universal critical parameters near a phase transition point are determined.
► The obtained values of the critical parameters show that critical behavior of La0.87K0.13MnO3 manganite corresponds to the model of classical 3D Heisenberg ferromagnetic.