摘要
本文研究非晶态Co_(70)Cr_(20)Zr(10)合金在居里温度附近的磁性,样品的磁特性符合二级相变规律。得到临界指数β=0.45±0.02,γ=1.9±0.1,δ=5.13±0.05。Co_(70)Cr_(20)Zr_(10)合金的居里温度为Tc=(186.7±0.2)K。临界指数β,γ,δ满足γ=β(δ-1)关系,但临界指数值都偏离三维Heisenberg模型的理论值,这种行为可能起源于非晶态合金磁的不均匀性。讨论了Kouvel-Fisher(K-F)参数γ(T)对温度T的依赖关系。
Magnetic properties of the amorphous Co70Cr20Zr10 alloys near the Curie temperature are reported. The behavior is found to obey second-order phase transition laws with critical indices: β=0.45 ± 0.02, γ= 1.9 ±0.1, δ = 5.13±0.05, and the ferromagnetic Curie temperature Tc = (186.7±0.2)K. The critical indices satisfy the scaling law relationship γ = β(δ- 1), but their values deviated with the 3D-Heisenberg model. This behavior may arise from the magnetically inhomogeneous behavior of the alloy. Finally, the temperature dependence of the Kouvel-Fisher exponent γ(T) is discussed.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1991年第12期2006-2011,共6页
Acta Physica Sinica
基金
北京市自然科学基金资助的课题
