期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 374, 期 -, 页码 539-543出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2014.09.010
关键词
Mixed-spin model; Green's function method; Magnetic property; Single-ion anisotropy; Susceptibility
资金
- Natural Science Foundation of China [11404046, 11347217, 61201119]
- Basic Research Foundation of Chongqing Education Committee of China [KJ130615]
- Chongqing Science & Technology Committee of China [cstc2014jcyjA50013, cstc2013jjB50001]
The double-time Green's function method is used to investigate the paramagnetic properties of ferromagnetic mixed-spin chain system within the random-phase approximation and Anderson-Callen's decoupling approximation. The analytic expressions of the transverse susceptibility, longitudinal susceptibility and correlation length are obtained under transverse and longitudinal magnetic field. Using the analytic expressions of the transverse and longitudinal susceptibility to fit the experimental results, our results well agree with experimental data and the results from the high temperature series expansion within a simple Pade approximation. (C) 2014 Elsevier B.V. All rights reserved.
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