Positron annihilation study on the stress-field pinning mechanism in (eu,y)-123 superconductors
文献类型：期刊论文
| 作者 | Li, Y; Cui, LJ; Cao, GH; Ma, QZ; Tang, CG; Wang, Y; Wei, L; Zhang, YZ; Zhao, ZX; Baggio-Saitovitch, E |
| 刊名 | Physica c
 |
| 出版日期 | 1999-03-01 |
| 卷号 | 314期号:1-2页码:55-68 |
| 关键词 | Positron annihilation Stress-field pinning Eu-doped y-123 superconductor |
| ISSN号 | 0921-4534 |
| 通讯作者 | Li, y(yli@cbpfsu1.cat.cbpf.br) |
| 英文摘要 | The simultaneous measurements of doppler-broadened radiation spectra and lifetime spectra have been performed on (y1-xeux)ba2cu3o7-y (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1) superconductors. the mean lifetime and s-parameter, respectively show a characteristic significantly symmetric to eu-doping concentration. since lifetime and doppler broadening spectroscopies are rather sensitive to the variation of the lattice distortion and defects induced by the stress-field of lattice mismatch, such symmetric behaviors of the s-parameter and the mean lifetime suggest a striking characteristic of stress in y1-xeux-123 superconductor. when the doping concentration x reaches 30%, the density of defects corresponding to stress-field appears the maximum, and there is an optimum distribution of the stress-field so as to increase critical current j(c) in eu-doped y-123 superconductors, our results of the critical current density obtained by means of measurements of susceptibility chi'(t,h-ac) and chi''(t,h-ac) also suggest that the enhancement of the critical current density to reach an optimum when eu doping x is 30%. we also qualitatively discuss experimental results in the framework of the model of stress-field pinning. the model calculating results also show the stress-field induced by lattice mismatch is an effective pinning center, and further conform that the stress pinning mechanism is dominant in re-doped y-123 superconductors, (c) 1999 published by elsevier science b.v. all rights reserved. |
| WOS关键词 | HIGH-TEMPERATURE SUPERCONDUCTORS ; CU-O ; LATTICE-MISMATCH ; SINGLE-CRYSTALS ; FLUX ; YBA2CU3O7-DELTA ; TRANSPORT ; OXYGEN ; FILMS ; PHASE |
| WOS研究方向 | Physics |
| WOS类目 | Physics, Applied |
| 语种 | 英语 |
| WOS记录号 | WOS:000079428700008 |
| 出版者 | ELSEVIER SCIENCE BV |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2176290 |
| 专题 | 高能物理研究所 |
| 通讯作者 | Li, Y |
| 作者单位 | 1.Univ Sci & Technol Beijing, Dept Mat Phys, Beijing 100083, Peoples R China 2.Chinese Acad Sci, Lab Nucl Anal Tech, Beijing 100080, Peoples R China 3.Chinese Acad Sci, Natl Lab Superconduct, Beijing 100080, Peoples R China 4.Ctr Brasileiro Pesquisas Fis, BR-22290180 Rio De Janeiro, Brazil |
| 推荐引用方式 GB/T 7714 | Li, Y,Cui, LJ,Cao, GH,et al. Positron annihilation study on the stress-field pinning mechanism in (eu,y)-123 superconductors[J]. Physica c,1999,314(1-2):55-68. |
| APA | Li, Y.,Cui, LJ.,Cao, GH.,Ma, QZ.,Tang, CG.,...&Baggio-Saitovitch, E.(1999).Positron annihilation study on the stress-field pinning mechanism in (eu,y)-123 superconductors.Physica c,314(1-2),55-68. |
| MLA | Li, Y,et al."Positron annihilation study on the stress-field pinning mechanism in (eu,y)-123 superconductors".Physica c 314.1-2(1999):55-68. |
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