PHASE DEVELOPMENT OF TL2BA2CACU2O8 THIN-FILMS ON LAALO3 SUBSTRATES

被引：15

作者：

LANHAM, M

JAMES, TW

EDDY, M

LANGE, FF

CLARKE, DR

机构：

[1] Materials Department, University of California, Santa Barbara

来源：

APPLIED PHYSICS LETTERS | 1993年 / 62卷 / 23期

关键词：

D O I：

10.1063/1.109149

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The evolution of phases leading to the formation of epitaxial films of nominal composition Tl2Ba2CaCU2O8 on (100) LaAlO3 by post-deposition annealing of amorphous precursor films has been investigated by examining interrupted heat-treatment samples using analytical microscopy and x-ray diffraction. The superconductor, with a composition of Tl1.8Ba2Ca0.94CU2.6Ox, forms from a melt, which itself formed from intermediary crystalline phases during the continual loss of Tl2O. It is concluded that Tl1.8Ba2Ca0.94CU2.6Ox, CU2O, and T13Ca5Ox are in subsolidus equilibrium and that a melt phase exists between at least 780 and 860-degrees-C under reducing conditions controlled by the Tl2O vapor.

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页码：3028 / 3030

页数：3

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