Enhancement of T-c of CyCu1-yBa2Ca2Cu3Ox from 67 K to 120 K by reduction treatments

被引：40

作者：

Chaillout, C ^{[1
]}

Le Floch, S ^{[1
]}

Gautier, E ^{[1
]}

Bordet, P ^{[1
]}

Acha, C ^{[1
]}

Feng, Y ^{[1
]}

Sulpice, A ^{[1
]}

Tholence, JL ^{[1
]}

Marezio, M ^{[1
]}

机构：

[1] UJF, CNRS, CRTBT, F-38042 GRENOBLE 09, FRANCE

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 1996年 / 266卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(96)00196-7

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The T-c of the CyCu1-yBa2Ca2Cu3O8+delta (y approximate to 0.5) phase, synthesized under high pressure, has been raised from 67 K to about 120 K by heat-treatments under reducing conditions. An increase of both a and c lattice parameters occurs concomitantly with that of T-c (before: a = 3.858 (1), c = 14.766 (9) Angstrom, after: a approximate to 3.862(1), c approximate to 14.825 (3) Angstrom). Subsequent heat-treatments under oxygen atmosphere lead, reversibly, to a decrease of T-c and of the lattice parameters. Consequently, the increase of T-c has been associated with an oxygen loss. Measurements of the resistivity under high pressure indicate that after reduction the overdoped as-prepared samples go towards the optimal doping. A structural model is proposed about the position of the mobile oxygen in the basal plane of the structure.

引用

页码：215 / 222

页数：8

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