一种等效于反铁磁海森伯混合自旋链的铁磁-反铁磁交替自旋链

蒋建军; 杨翠红; 刘拥军

doi:10.7498/aps.61.067502

摘要

利用严格对角化方法研究了一种自旋为1/2的铁磁-反铁磁交替自旋链的物理性质.计算了自旋关联函数、自旋z方向分量、自旋激发谱和磁化曲线等基本物理量,并将这些物理量和自旋为(1,1/2)的混合反铁磁自旋链对应的物理性质进行了比较.结果表明,当铁磁作用居于主导地位时,该模型的物理行为等效于混合自旋模型.因此,可以通过分析铁磁-反铁磁交替自旋链的物理性质研究混合自旋链的物理行为.

关键词:

By using the method of exact diagonalization, the properties of the spin-1/2 ferromagnetic-antiferromagnetic alternating Heisenberg chain are investigated. The spin-spin correlation, the sublattice magnetizations, the spin excitation spectrum and the magnetization curve of the model are calculated and compared with the corresponding properties of the mixed spin chain. The results show that the behaviors of the alternating Heisenberg chain are equivalent to those of the mixed spin chain when the ratio of antiferromagnetic to ferromagnetic coupling strength is very small. So, the properties of the mixed spin chain can be analyzed by using the spin-1/2 ferromagnetic-antiferromagnetic-antiferromagnetic alternating Heisenberg chain.

Keywords:

作者及机构信息

1.
三江学院物理教研室, 南京 210012;

2.
南京信息工程大学数理学院, 南京 210044;

3.
扬州大学物理科学与技术学院, 扬州 225002

通信作者: 蒋建军, jian_jun_jiang@yahoo.cn

基金项目: 国家自然科学基金青年科学基金(批准号: 10804053)和江苏省青蓝工程资助的课题.

Authors and contacts

1.
Department of Physics, Sanjiang College, Nanjing 210012, China;

2.
Faculty of Mathematics and Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China;

3.
School of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China

Corresponding author: Jiang Jian-Jun, jian_jun_jiang@yahoo.cn

Funds: Project supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 10804053) and Qing Lan Project of Jiangsu Province, China.

参考文献

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施引文献

[1]	Anderson P W 1987 Science 235 1196
[2]
[3]	Lin N, Yu Z R 1993 Acta Phys. Sin. 42 1990 (in Chinese) [林念, 于祖荣 1993 物理学报 42 1990]
[4]
[5]	Wang Y S 2002 Acta Phys. Sin. 51 1458 (in Chinese) [王延申 2002 物理学报 51 1458]
[6]
[7]	Haldane F D M 1983 Phys. Rev. Lett. 50 1153
[8]
[9]	Buyers W J L, Morra R M, Armstrong R L, Hogan M J, Gerlach P, Hirakawa K 1986 Phys. Rev. Lett. 56 371
[10]	Affleck I 1989 J. Phys.: Condens. Mat. 1 3047
[11]
[12]	Shi Y, Xing H Z, Zhang H W, Jing Y L, Liu Y L 2005 Acta Phys. Sin. 54 0280 (in Chinese) [石玉, 邢怀中, 张怀武, 荆玉兰, 刘颖力 2005 物理学报 54 0280]
[13]
[14]	Hung H H, Gong C D 2005 Phys. Rev. B 71 054413
[15]
[16]
[17]	Pan L H, Gong C D 2008 J. Phys.: Condens. Mat. 20 215232
[18]
[19]	Yamamoto S, Brehmer S Mikeska H J 1998 Phys. Rev. B 57 13610
[20]	Pati S K, Ramasesha S, Sen D 1997 J. Phys.: Condens. Mat. 9 8707
[21]
[22]
[23]	Sakai T, Yamamoto S 1999 Phys. Rev. B 60 4053
[24]	Yamamoto S, Hori H 2005 Phys. Rev. B 72 054423
[25]
[26]
[27]	Fukushima N, Honecker A, Wessel S, Brenig W 2004 Phys. Rev. B 69 174430
[28]	Hagiwara M, Minami K, Narumi Y, Tatani K, Kindo K 1998 J. Phys. Soc. Jpn. 67 2209
[29]
[30]
[31]	Brehmer S, Mikeska H J, Yamamoto S 1997 J. Phys.: Condens. Mat. 9 3921
[32]	Kolezhuk A K, Mikeska H J, Yamamoto S 1997 Phys. Rev. B 55 R3336
[33]
[34]
[35]	Oshikawa M, Yamanaka M, Affleck I 1997 Phys. Rev. Lett. 78 1984
[36]	Gu B, Su G, Gao S 2005 J. Phys.: Condens. Mat. 17 6081
[37]
[38]	Gu B, Su G, Gao S 2006 Phys. Rev. B 73 134427
[39]

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