Order-disorder transitions: structural and magnetic ordering in double perovskites

被引：8
|
作者：
Sanyal, Prabuddha [1 ]
Tarat, Sabyasachi [1 ]
Majumdar, Pinaki [1 ]
机构：
[1] Harish Chandra Res Inst, Allahabad 211019, Uttar Pradesh, India
来源：
INDIAN JOURNAL OF PHYSICS | 2010年 / 84卷 / 10期
关键词：
Order-disorder transitions; antisite defects; structure factor; MAGNETORESISTANCE; SR2FEMOO6; MODEL;
D O I：
10.1007/s12648-010-0129-5
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Using an effective lattice gas-like model for B-B' site ordering we study order-disorder transitions in double perovskite materials A(2)BB'O-6. We motivate this effective model from a microscopic hamiltonian. Using this model, we are able to address several experimentally observed issues including nonmonotonic dependence of the degree of order on annealing temperature, and the rapid decrease of order upon overdoping with either B or B' species. We also study ordering in the 'ternary' compounds A(2)BB'(1-y)BaEuro(y)(3)O(6), using a variant of the Blume-Emery-Griffiths model. Several issues related to structural and magnetic ordering are discussed.
引用
收藏
页码：1379 / 1390
页数：12
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