Theoretical study of the magnetic excitations in compound Pr2BaNiO5

被引：0
|
作者：
Song, Y [1 ]
机构：
[1] Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China
[2] Beijing Union Univ, Vocat Tech Teachers Coll, Beijing, Peoples R China
来源：
MODERN PHYSICS LETTERS B | 2002年 / 16卷 / 26期
基金：
中国国家自然科学基金;
关键词：
mixed-spin antiferromagnetic Heisenberg model; Schwinger-boson mean-field theory; Haldane gap; compound Pr2BaNiO5;
D O I：
10.1142/S0217984902004743
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A three-dimensional mixed-spin antiferromagnetic Heisenberg model is introduced to describe the interesting property of the coexistence of Haldane gap and antiferromagnetic long-range order in compound Pr2BaNiO5. Within the Schwinger-boson mean-field theory, we investigate the temperature dependences of the Haldane gap and ordered parameters both below and above the Neel temperatures, and establish a theoretical explanation for the increase of the Haldane gap below the Neel temperature. Our results are in good agreement with neutron scattering experiments.
引用
收藏
页码：991 / 998
页数：8
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