Inducing superconductivity and structural transformations by fluorination of reduced YBCO

被引：40

作者：

Shpanchenko, RV ^{[1
]}

Rozova, MG ^{[1
]}

Abakumov, AM ^{[1
]}

Ardashnikova, EI ^{[1
]}

Kovba, ML ^{[1
]}

Putilin, SN ^{[1
]}

Antipov, EV ^{[1
]}

Lebedev, OI ^{[1
]}

VanTendeloo, G ^{[1
]}

机构：

[1] UNIV ANTWERP,RUCA,EMAT,B-2020 ANTWERP,BELGIUM

来源：

PHYSICA C | 1997年 / 280卷 / 04期

关键词：

YBCO; fluorination; electron microscopy;

D O I：

10.1016/S0921-4534(97)00343-2

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Bulk superconductivity with T-c up to 94 K has been induced by fluorination of non-superconducting YBa2Cu3O6.11 using XeF2 as a fluorination agent. Strong changes on X-ray patterns were found after fluorination of reduced YBCO. High resolution electron microscopy of superconducting samples showed the presence of a new phase with c approximate to 13 Angstrom which exists as noticeable areas included within a matric of the 123 structure or which occurs as isolated defects with a limited extension. All fluorinated compounds exhibited a strong disorder along the c-direction resulting in a 'loss' of c-parameter on X-ray patterns, The present results demonstrate that fluorine indeed enters the YBCO structure with a significant structural rearrangement for the high level of fluorination. The structure of the fully fluorinated YBa2Cu3O6F2 phase, possibly responsible for superconductivity, has been deduced from high resolution electron microscopy. (C) 1997 Elsevier Science B.V.

引用

页码：272 / 280

页数：9

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