Flux growth of superconducting La2CuO4 single crystals

被引：1

作者：

Chen, C ^{[1
]}

Smith, DC ^{[1
]}

Gay, P ^{[1
]}

Ryan, JF ^{[1
]}

机构：

[1] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

来源：

PHYSICA C | 2000年 / 341卷

基金：

英国工程与自然科学研究理事会;

关键词：

Flux growth - Lanthanum cuprate crystals;

D O I：

10.1016/S0921-4534(00)00579-7

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report here the first observation of superconductivity in lanthanum cuprate crystals grown in an ambient atmosphere. The best result achieved so far is: (1) superconducting transition temperature T-c = 32 K with DeltaT(c) similar to3 K by ac susceptibility measurement, and (2) T-c (on set) = 36 K and T-c (zero resistance) = 26 K by resistivity measurements. The solubility curve of La2CuO4 in molten CuO has been established, and large single crystals with size up to 16 x 15 x 0.1 mm(3) have been obtained. The morphology of the superconducting crystals (thin plate) is remarkably different from that of insulating crystals (pyramid), which suggests a layer growth mechanism. The mechanism produces an enlarged unit cell which permits O2- intercalation. This "soft" oxygenation has marked influence on the superconducting properties.

引用

页码：535 / 536

页数：2

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