二维磁性系统和准一维磁性纳米管的内能

计算物理 ›› 2015, Vol. 32 ›› Issue (1): 86-92.

二维磁性系统和准一维磁性纳米管的内能

米斌周¹, 冯翠菊¹, 祁云平², 丁东¹, 薛永红¹

1. 华北科技学院基础部, 北京 101601;
2. 西北师范大学物电学院, 甘肃兰州 730070

收稿日期:2014-01-06 修回日期:2014-06-17 出版日期:2015-01-25 发布日期:2015-01-25
作者简介:米斌周(1980-),男,硕士,讲师,博士生,主要利用多体格林函数法进行磁性材料的理论计算,E-mail:mbzfjerry2008@126.com
基金资助:
中央高校基本科研业务费专项资金(3142012017);河北省教育厅科技基金(A2013024);河北省高等学校科学技术研究项目(QN2014330)资助项目

Intrinsic Energies of Two-dimensional Heisenberg Magnets and Ferromagnetic Single-walled Nanotubes

MI Binzhou¹, FENG Cuiju¹, QI Yunping², DING Dong¹, XUE Yonghong¹

1. Department of Basic Curriculum, North China Institute of Science and Technology, Beijing 101601, China;
2. College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China

Received:2014-01-06 Revised:2014-06-17 Online:2015-01-25 Published:2015-01-25

摘要/Abstract

摘要： 采用量子统计理论的多体格林函数法计算二维单离子各向异性海森伯铁磁体、反铁磁体以及单壁铁磁纳米管的内能,对比铁磁体和反铁磁体的结果.在相同的参量下,反铁磁能量总是低于相应的铁磁能量(相变点除外).由于反铁磁能量随温度上升的速度较铁磁能量快,当温度升高到居里点T_C和奈尔点T_N时(T_C=T_N),铁磁能量和反铁磁能量相等.横向关联效应对系统内能的影响较大,不能忽略.

关键词: 海森伯模型, 二维系统, 磁性纳米管, 内能, 多体格林函数法

Abstract: Intrinsic energy of two-dimensional square lattice single-ion anisotropic Heisenberg ferromagnets,antiferromagnets,and ferromagnetic single-walled nanotubes are calculated with many-body Green's function method in quantum statistical theory.Calculated results of ferromagnets and antiferromagnets are compared.Between zero temperature and phase transition point,including zero temperature,anti-ferromagnetic energy is always lower than that of ferromagnetic energy.Calculation method of intrinsic energy in this paper is applicable not only to ferromagnetic system,but also suitable for antiferromagnetic system and ferrimagnetic system,as well as ferromagnetic single-walled nanotubes.Intrinsic energies are greatly lower than classical energies, which shows that transverse correlation effect is important.

Key words: Heisenberg model, two-dimensional systems, magnetic nanotubes, intrinsic energy, many-body Green's function method

中图分类号:

O469

米斌周, 冯翠菊, 祁云平, 丁东, 薛永红. 二维磁性系统和准一维磁性纳米管的内能[J]. 计算物理, 2015, 32(1): 86-92.

MI Binzhou, FENG Cuiju, QI Yunping, DING Dong, XUE Yonghong. Intrinsic Energies of Two-dimensional Heisenberg Magnets and Ferromagnetic Single-walled Nanotubes[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2015, 32(1): 86-92.

[1]	卢贵武, 周开学, 储浚, 任兰亭. 离子—偶极混合物的集团展开方法研究[J]. 计算物理, 1999, 16(4): 351-357.
[2]	卢贵武, 周开学, 储浚. 磁场对水系统内能影响的MC计算机模拟方法研究[J]. 计算物理, 1998, 15(4): 503-508.