CRITICAL PARAMETERS OF PEROVSKTE COMPOSITION Pr5/8Ca3/8Mn0.9875Pd0.0125O3, EXHIBITING THE CROSSOVER OF FIRST AND SECOND ORDER PHASE TRANSITION

Tóm tắt

A compound of Pr5/8Ca3/8Mn0.9875Pd0.0125O3 with orthorhombic structure was fabricated using a sol-gel method. The critical parameters with β=0.188(5) and γ=1.005(3) calculated from the magnetic data around Curie temperature of 260 K are quite close to those of the tricritical mean field model. This indicates that the magnetic interaction in the compound is a combination of the long- and short-range interactions. It means the paramagnetic-ferromagnetic phase transition of Pr5/8Ca3/8Mn7.9/8Pd0.1/8O3 compound is crossover of the first- and second-order phase transitions.
Keywords: Perovskte, critical parameters, phase transition.