High-pressure synthesis of 0212-, 1201- and 1212-type copper oxides

被引：10

作者：

Takayama-Muromachi, E ^{[1
]}

Kawashima, T ^{[1
]}

Zhigadlo, ND ^{[1
]}

Drezen, T ^{[1
]}

Isobe, M ^{[1
]}

Matveev, AT ^{[1
]}

Kimoto, K ^{[1
]}

Matsui, Y ^{[1
]}

机构：

[1] Natl Inst Res Inorgan Mat, Tsukuba, Ibaraki 3050044, Japan

来源：

PHYSICA C | 2001年 / 357卷

关键词：

high-pressure synthesis; (Nd; Ce)(2) (+) xCaCu2Oy; CCa2CuO5 (+ delta); RuSr(2)LnCu(2)O(8) (Ln = Dy; Y; Ho; Er);

D O I：

10.1016/S0921-4534(01)00237-4

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

High-pressure synthesis technique was applied for 0212-, 1201- and 1212-type copper oxides, to find several new phases. the (Nd, Ce)(2+x)CaCu2Oy phase has a shear structure derived from the 0212 structure. It has an orthorhombic phases. The (Nd,Ce)2_C Y I = 19.3 A which are related to the tetragonal lattice as as = /2a, bs = 5,/2b, superlattice of a(s) = 5.4, b(s) = 27.4 and c(s) = 19.3 Angstrom which are related to the tetragonal lattice as a(s) = root 2a, b(s) = 5 root 2b, c(s) = c. Two step weak ferromagnetic transitions were observed at 150 and 40 K in this Ce-doped phase. The 1201 phase of CCa2CuO5+delta was prepared for the first time. Superconductivity appeared below approximate to 11 K in the samples with high excess oxygen contents. The 1212 phases of RuSr(2)LnCu(2)O(8) were isolated for smaller rare earth elements of Ln = Dy, Y, Ho, Er. The Y-analogue undergoes ferromagnetic transition near 150 K followed by superconducting transition at 39 K. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：318 / 323

页数：6

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