Periodic instanton and phase transition in quantum tunneling of spin systems
文献类型：期刊论文
| 作者 | Zhang, YB ; Nie, YH ; Kou, SP ; Liang, JQ ; Muller-Kirsten, HJW ; Pu, FC |
| 刊名 | PHYSICS LETTERS A
 |
| 出版日期 | 1999 |
| 卷号 | 253期号:5-6页码:345 |
| 关键词 | FERROMAGNETIC PARTICLES METASTABLE STATES ESCAPE RATE MAGNETIZATION DECAY APPROXIMATION MOLECULES FIELD |
| ISSN号 | 0375-9601 |
| 通讯作者 | Zhang, YB (reprint author), Chinese Acad Sci, Inst Phys, POB 603, Beijing 100080, Peoples R China. |
| 中文摘要 | The quantum-classical transitions of the escape rates in a uniaxial spin model relevant to the molecular magnet Mn12Ac and a biaxial anisotropic ferromagnetic particle are investigated by applying the periodic instanton method. The effective free energies are expanded around the top of the potential barrier in analogy to the Landau theory of phase transitions. We show that the first-order transitions occur below the critical external magnetic field h(x) = 1/4 for the uniaxial spin model and beyond the critical anisotropy constant ratio lambda = 1/2 for the biaxial ferromagnetic grains, which are in good agreement with earlier works. (C) 1999 Published by Elsevier Science B.V. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/50673]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Zhang, YB,Nie, YH,Kou, SP,et al. Periodic instanton and phase transition in quantum tunneling of spin systems[J]. PHYSICS LETTERS A,1999,253(5-6):345. |
| APA | Zhang, YB,Nie, YH,Kou, SP,Liang, JQ,Muller-Kirsten, HJW,&Pu, FC.(1999).Periodic instanton and phase transition in quantum tunneling of spin systems.PHYSICS LETTERS A,253(5-6),345. |
| MLA | Zhang, YB,et al."Periodic instanton and phase transition in quantum tunneling of spin systems".PHYSICS LETTERS A 253.5-6(1999):345. |
入库方式： OAI收割
来源：物理研究所
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