SUPERCONDUCTIVITY AND CRYSTAL-STRUCTURE OF LN2BA4CU7O14+DELTA (LN=ER, Y, HO, DY, ND) - A HIGH-RESOLUTION POWDER NEUTRON-DIFFRACTION STUDY

被引：8

作者：

CURRIE, DB ^{[1
]}

WELLER, MT ^{[1
]}

LANCHESTER, PC ^{[1
]}

WALIA, R ^{[1
]}

机构：

[1] UNIV SOUTHAMPTON,DEPT PHYS,SOUTHAMPTON SO9 4XY,HANTS,ENGLAND

来源：

PHYSICA C | 1994年 / 224卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(94)90603-3

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The crystal structure of Ln2Ba4Cu7O14+delta (Ln=Y, lanthanide) is derived from alternate blocks of the LnBa2Cu3O7-x (123) and LnBa2Cu4O8 (124) structures thus incorporating structural regions of oxygen non-stoichiometry and fixed stoichiometry, respectively. Samples containing a range of different lanthanide sizes and varying oxygen contents have been prepared by a high oxygen pressure method; seven have been examined using very high resolution powder neutron diffraction (PND); all have been examined using powder X-ray diffraction (XRD). AC susceptibility measurements indicate that removal of oxygen from the structure can result in either enhancement or reduction of T(c), depending on the initial oxygen content of the as-prepared material. The variations in T(c), changes in the detailed structure, oxygen content, and non-stoichiometry of the single chain copper site are discussed.

引用

页码：43 / 50

页数：8

共 15 条

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