Abnormal magnetism and phase transformation of a Heisenberg-like model with internal spin fluctuation
文献类型：期刊论文
| 作者 | Wang, HY ; Chen, KQ ; Wang, EG |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2002 |
| 卷号 | 66期号:9 |
| 关键词 | THIN FERROMAGNETIC-FILMS ULTRATHIN FE FILMS REORIENTATION TRANSITION MAGNETIZATION ANISOTROPY DIRECTION |
| ISSN号 | 1098-0121 |
| 通讯作者 | Wang, HY: Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China. |
| 中文摘要 | A series of YBa2CU3-xCoxOx (x = 0-0.50) samples have been studied by means of SEM, TEM, XRD and positron annihilation technology. Oxygen contents of the samples have been measured using a new volumetric method The microstructure evolution of the Co-doped YBCO is very similar to that in the Fe-doped YBCO. YBa2Cu3-xCoxOx undergoes a structure phase transition from orthorhombic to tetragonal between x = 0.12 and 0.15. Twin structure predominates when x is low (x < 0.05). With the increasing of x, tweed structure appears and its proportion increases till it becomes dominant. When x > 0 12, the tweed structure disappears completely. The grain boundary density increases with x and shows a sudden drop when x > 0.12. Similarly, the positron short lifetime component tau(1) shows a sudden drop between x = 0.12 and 0.15 Therefore, positron can be used as a sensitive probe for the O-T phase transition in this system. A possible model is proposed to describe the relationship between positron short lifetime component tau(1), and the concentrations of oxygen vacancy and twin (tweed) boundary. The experimental results can be satisfactorily explained by this model. (C) 2002 Elsevier Science B.V. All rights reserved. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-17 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/33410]  |
| 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 | Wang, HY,Chen, KQ,Wang, EG. Abnormal magnetism and phase transformation of a Heisenberg-like model with internal spin fluctuation[J]. PHYSICAL REVIEW B,2002,66(9). |
| APA | Wang, HY,Chen, KQ,&Wang, EG.(2002).Abnormal magnetism and phase transformation of a Heisenberg-like model with internal spin fluctuation.PHYSICAL REVIEW B,66(9). |
| MLA | Wang, HY,et al."Abnormal magnetism and phase transformation of a Heisenberg-like model with internal spin fluctuation".PHYSICAL REVIEW B 66.9(2002). |
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来源：物理研究所
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