| Structure and microstructure of superconductor sr2cuo3+delta (nominal delta=0.4) prepared under high pressure | |
| Yang, H.; Liu, Q. Q.; Li, F. Y.; Jin, C. Q.; Yu, R. C. | |
| 刊名 | Superconductor science & technology
 |
| 2006-09-01 | |
| 卷号 | 19期号:9页码:934-940 |
| ISSN号 | 0953-2048 |
| DOI | 10.1088/0953-2048/19/9/009 |
| 通讯作者 | Yu, r. c.(rcyu@aphy.iphy.ac.cn) |
| 英文摘要 | A single-phase superconductor sr2cuo3+delta with nominal delta = 0.4 ( detected from x-ray powder diffraction ( xrd) data) ( t-c = 75 k) has been synthesized using a high-pressure technique. the structure and microstructure of this material have been carefully studied by means of transmission electron diffraction ( ed), high-resolution transmission electron microscopy ( hrtem), electron energy-loss spectroscopy ( eels) and energy dispersive analysis of x-ray ( edx) techniques. interestingly enough, ed and hrtem investigations reveal that almost all grains of the tetragonal form sr2cuo3+d exhibit modulated features. this result strongly suggests that the superconductivity at 75 k in the material is associated with the modulated phases. two types of modulated phases having different primitive cells but equal in volume are found in the sample. one is the face-centred orthorhombic modulated phase with a space group fmmm and lattice constants of similar to 5 root 2a(p) x 5 root 2a(p) x c(p). the other is the base-centred monoclinic modulated phase with a space group c2/m and unit-cell parameters of am = 5 root 2a(p), b(m) = cp, cm = root 26 root 2/2a(p) and beta = 101.3 degrees. the relative ratio of the former to the latter phase contents is about 4: 1. oxygen k absorption edges from eels measurements suggest that the two modulated phases have the same hole intensity. defects such as twin boundaries, small-angle asymmetrical tilt boundaries and dislocations are frequently observed in the c2/m monoclinic modulated phase, and some of them are carefully studied by means of hrtem, eels and edx. |
| WOS关键词 | INCOMMENSURATE MODULATED STRUCTURE ; TETRAGONAL SR2CUO3+X ; HEAT-TREATMENT ; SR2CUO2+DELTA-CL2-Y ; TEM |
| WOS研究方向 | Physics |
| WOS类目 | Physics, Applied ; Physics, Condensed Matter |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000241156100009 |
| 内容类型 | 期刊论文 |
| URI标识 | http://www.corc.org.cn/handle/1471x/2373630 |
| 专题 | 物理研究所 |
| 通讯作者 | Yu, R. C. |
| 作者单位 | Beijing Natl Lab Condensed Matter Phys, Inst Phys, Lab Extreme Condit Phys, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, H.,Liu, Q. Q.,Li, F. Y.,et al. Structure and microstructure of superconductor sr2cuo3+delta (nominal delta=0.4) prepared under high pressure[J]. Superconductor science & technology,2006,19(9):934-940. |
| APA | Yang, H.,Liu, Q. Q.,Li, F. Y.,Jin, C. Q.,&Yu, R. C..(2006).Structure and microstructure of superconductor sr2cuo3+delta (nominal delta=0.4) prepared under high pressure.Superconductor science & technology,19(9),934-940. |
| MLA | Yang, H.,et al."Structure and microstructure of superconductor sr2cuo3+delta (nominal delta=0.4) prepared under high pressure".Superconductor science & technology 19.9(2006):934-940. |
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