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

  • Le Viet Bau
  • Nguyen Thi Ngoc
  • Trịnh Thi Huyen
Từ khóa: Perovskte, critical parameters, 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 ​​b=0.188(5) and g=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.

điểm /   đánh giá
Phát hành ngày
2024-02-26