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

页码：991 / 998

页数：8

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