Magnetic critical behavior in the intermetallic compound (Ce0.65Pr0.35)2Co7

作者：Fan, Jiyu; Liu, Hao; Xu, Lisha; Zhong, Xichun^*; Perov, Nikolai; Wang, Caixia; Ma, Chunlan; Qian, Fengjiao; Zhu, Yan; Yang, Hao^*

来源：Journal of Magnetism and Magnetic Materials, 2020, 514: 167208.

DOI：10.1016/j.jmmm.2020.167208

• Phase transitions
• Critical exponents
• Ternary alloy

Clarification of magnetic phase transition nature and critical behavior is an essential step in the development of new magnetic functional materials. In this work, we studied critical properties of intermetallic compound (Ce0.65Pr0.35)(2)Co-7 by bulk dc magnetization around the paramagnetic to ferromagnetic phase transition. It exhibits a second-order magnetic phase transition with T-C = 214 K. Critical exponents beta = 0.546(5) and gamma = 1.054(5) are obtained by the modified Arrott plot, whereas delta = 2.843 is obtained by a critical isotherm analysis at T-C. These critical exponents not only obey the Widom relation delta = 1 + gamma/beta, but also collapse the isothermal magnetization M-H-T data into two branches below and above T-C following the single scaling equation M(H, epsilon) = epsilon(beta)f +/- (H/epsilon(beta+gamma)). Although the obtained exponents are close to the theoretical values of mean-field model, a noticeable deviation unable to be ignored, indicating the existence of localized magnetic interaction which competes with a long-range ferromagnetic state. Our results will establish a sound theoretical basis for understanding the complex magnetic interaction in the light rare earths ternary alloy.

• 单位
  1; 南京航空航天大学