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Effects of the Cu Doping on Critical Behavior of / Phung, ThanhPQ

Tác giả : Phung, ThanhPQ

Năm xuất bản : 2012-04

Chủ đề : 1. Critical behavior. 2. Article.

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We have studied the influence of the Cu-doping on the critical properties of a polycrystalline sample of prepared by solid-state reaction. Analyses of static magnetization data in the vicinity of the ferromagnetic-paramagnetic phase transition based on the modified Arrott plot reveal critical parameters of , and .These parameters are in good agreement with a magnetic equation of state , where (the reduced temperature), for and for . Comparing with theoretical models, the critical exponents in our case are close to those expected for the mean-field theory. This reflects that the Cu doping leads to the second-order phase transition in while the parent compound of exhibits the first-order phase transition. Such the phenomenon is assigned to changes in structural parameters, ratio, and magnetic interaction mechanisms caused by Cu dopants.
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 Thư viện  Ký hiệu xếp giá  Dữ liệu nguồn
Viện Tài nguyên và Môi trường - ĐHQGHN
https://repository.vnu.edu.vn/handle/VNU_123/10115