Critical behavior of electrical resistivity in amorphous Fe–Zr alloys

[摘要] Electrical resistivity (ρ) of the amorphous (a-)Fe100-𝑐Zr𝑐 (𝑐 = 8.5, 9.5 and 10) alloys has been measured in the temperature range 77 to 300 K, which embraces the second-order magnetic phase transition at the Curie temperature point 𝑇𝑐. Analysis of the resistivity data particularly in the critical region reveals that these systems have a much wider range of critical region compared to other crystalline ferromagnetic materials. The value of 𝑇𝑐 and specific heat critical exponent, 𝛼 has the same values as those determined from our earlier magnetic measurements. The value of 𝛼 for all the present investigated alloys are in close agreement with the values predicted for three-dimensional (3D) Heisenberg ferromagnet systems, which gives contradiction to the earlier results on similar alloys. It is observed from the analysis that the presence of quenched disorder does not have any influence on critical behavior.

[学科分类] 物理（综合）

[关键词] Amorphous materials;critical region;ac susceptibility;electrical resistivity;critical exponents.