Critical Behavior of Gd5Si2Ge1.9Ga0.1 near the Ferromagnetic-paramagnetic Phase Transition

摘要：

　　The critical behavior near the ferromagnetic-paramagnetic phase transition in Gd5Si2Ge1.9Ga0.1 has been investigated using a method based on the field dependence of isothermal entropy change.The reliability of the critical exponents determined in such a way has been examined through various techniques, like constructing the modified Arrott plot, applying the scaling law on the isothermal magnetization curves, and comparing the values with those obtained from the Kouvel-Fisher model.The resulting values of the exponents were estimated to be β =0.45(2), γ =1.31(5), δ =3.9(2) and n =0.69(1), close to the values predicted by the mean field theory.Hence, we concluded that the exchange interaction is of long-range type.

关键词： Gd5Si2Ge1.9Ga0.1 Critical exponent Phase transition Isothermal entropy change

作者: Zeng-ru Zhao Gao-feng Wang Xue-feng Zhang

作者单位: Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia Univers Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia Univers

会议类型: 国际会议

会议名称: The Eighth China National Conference on Functional Materials and Applications(第八届中国功能材料及其应用学术会议)

会议地点: 哈尔滨

会议语种:英文

页码: 855-860

在线出版日期: 2013-08-23（万方平台首次上网日期，不代表论文的发表时间）