Emergence of Griffiths phase and exploiting magnetic ordering state in the intermetallic LaCeCo7

作者：Wang, Weiyuan; Fan, Jiyu^*; Zhong, Xichun^*; Ma, Chunlan; Yang, Yu-E; Hu, Dazhi; Qian, Fengjiao; Zhu, Yan; Wang, Caixia; Yang, Hao^*

来源：Journal of Magnetism and Magnetic Materials, 2021, 529: 167868.

DOI：10.1016/j.jmmm.2021.167868

• Phase transitions
• Critical exponents

We have studied the evolution of Griffiths phase and the magnetic ordering state in the intermetallic compound LaCeCo7. A ferromagnetic-like ordering phase is built up at 260 K but an anomalous magnetic susceptibility related to the Griffiths phase occurs in 300 K. The studies of critical behavior confirm that LaCeCo7 exhibits a second-order paramagnetic-ferromagnetic phase transitions. The critical exponents of beta = 0.665, gamma = 1.151, and delta = 2.728 determined by the magnetic field dependence on magnetic entropy change method deviate a little from the theoretical estimated long-range mean-field model (beta = 0.5, gamma = 1.0, and delta = 3.0). This result implies that the disorder effect in the intermetallic LaCeCo7 possibly plays a key role on the anomalous critical behavior and the establishment of magnetic ordering phase.

• 单位
  南京航空航天大学