Thermodynamic quantum critical behavior of the anisotropic Kondo necklace model
文献类型：期刊论文
| 作者 | Reyes, D ; Continentino, MA ; Wang, HT |
| 刊名 | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
 |
| 出版日期 | 2009 |
| 卷号 | 321期号:5页码:348 |
| 关键词 | RENORMALIZATION-GROUP PHASE-DIAGRAM LATTICE MODEL GAP-FORMATION SPIN-LIQUID SYSTEMS ANTIFERROMAGNETISM TEMPERATURE ELECTRON |
| ISSN号 | 0304-8853 |
| 通讯作者 | Reyes, D (reprint author), Ctr Brasileiro Pesquisas Fis, Rua Dr Xavier Siguad,150 Urca, BR-22290180 Rio De Janeiro, Brazil. |
| 中文摘要 | The Ising-like anisotropy parameter delta in the Kondo necklace model is analyzed using the bond-operator method at zero and finite temperatures for arbitrary d dimensions. A decoupling scheme on the double time Green's functions is used to find the dispersion relation for the excitations of the system. At zero temperature and in the paramagnetic side of the phase diagram, we determine the spin gap exponent vz approximate to 0: 5 in three dimensions and anisotropy between 0 <= delta <= 1, a result consistent with the dynamic exponent z = 1 for the Gaussian character of the bond-operator treatment. On the other hand, in the antiferromagnetic phase at low but finite temperatures, the line of Neel transitions is calculated for delta << 1. For d > 2 it is only re-normalized by the anisotropy parameter and varies with the distance to the quantum critical point (QCP) vertical bar g vertical bar as, T(N) alpha vertical bar g vertical bar(Psi) where the shift exponent Psi = 1/(d-1). Nevertheless, in two dimensions, a long-range magnetic order occurs only at T = 0 for any delta << 1. In the paramagnetic phase, we also find a power law temperature dependence on the specific heat at the quantum critical trajectory J/t = (J/t)(c), T ! 0. It behaves as C(V) alpha T(d) for delta << 1 and approximate to 1, in concordance with the scaling theory for z = 1. (c) 2008 Elsevier B. V. All rights reserved. |
| 收录类别 | SCI |
| 资助信息 | NKBRSF of China [2006CB921400.]; Brazilian Agencies CNPq; FAPERJ |
| 语种 | 英语 |
| 公开日期 | 2013-09-23 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/45785]  |
| 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 | Reyes, D,Continentino, MA,Wang, HT. Thermodynamic quantum critical behavior of the anisotropic Kondo necklace model[J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS,2009,321(5):348. |
| APA | Reyes, D,Continentino, MA,&Wang, HT.(2009).Thermodynamic quantum critical behavior of the anisotropic Kondo necklace model.JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS,321(5),348. |
| MLA | Reyes, D,et al."Thermodynamic quantum critical behavior of the anisotropic Kondo necklace model".JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 321.5(2009):348. |
入库方式： OAI收割
来源：物理研究所
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