STUDY OF OXYGEN ORDERING IN HTC SUPERCONDUCTORS BY MAGNETIC-RESONANCE OF DIFFERENT NUCLEI

被引：9

作者：

LUTGEMEIER, H ^{[1
]}

HEINMAA, I ^{[1
]}

EGOROV, AV ^{[1
]}

机构：

[1] KAZAN VI LENIN STATE UNIV, KAZAN, RUSSIA

来源：

PHYSICA SCRIPTA | 1993年 / T49A卷

关键词：

D O I：

10.1088/0031-8949/1993/T49A/023

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

NMR of Tm-169 and NQR/NMR of (63)/(CU)-C-65 was applied to investigate the order of oxygen in the HTc superconductors of the type RBa(2)Cu(3)O(x). From the spectra of three different lattice sites, one for Tm and two for Cu, it is evident, that three ordered structures exist: tetra for x = 6.0, ortho-II for x = 6.5 and ortho-I for x = 7.0. No other ordered structures could be detected. A coexistence of ortho-I and -II is evident in a wide region between 6.6 and 6.8. The existence of extended domains of ortho-II is essential for the onset of superconductivity. In the tetragonal region below 6.3 we find mainly insulated oxygen ions in the Cu(1) plane; in supercon ducting samples of the 60 K plateau oxygen is ordered in chains of a mean length of about 12 oxygen ions. In the region of the 90 K plateau the chains become very long and the oxygen vacancies are clustered in empty fragments of chains.

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页码：137 / 142

页数：6

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