THE CRYSTAL-STRUCTURE OF THE LA1.6SR0.4CACU2O6+1-DELTA SUPERCONDUCTOR

被引：55

作者：

CAVA, RJ ^{[1
]}

SANTORO, A ^{[1
]}

KRAJEWSKI, JJ ^{[1
]}

FLEMING, RM ^{[1
]}

WASZCZAK, JV ^{[1
]}

PECK, WF ^{[1
]}

MARSH, P ^{[1
]}

机构：

[1] NIST,GAITHERSBURG,MD

来源：

PHYSICA C | 1990年 / 172卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(90)90652-U

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The crystal structure of the La1.6Sr0.4CaCu2O6 +/-delta-superconductor has been determined by neutron diffraction powder profile refinement at room temperature on a slightly oxygen deficient sample (delta = - 0.06, T(c) = 55 K). The crystal structure is very similar to that of the nonsuperconducting host compound La1.9Ca1.1Cu2O6-delta. Sr substitutes on the nine coordinate La sites, and there may be some La/Ca mixing on the eight coordinate metal site between the CuO2 planes. Oxygen deficiency occurs in the apical oxygen sites. The compound has the tetragonal symmetry characteristic of a square CuO2 plane at room temperature and 10 K, making it differ from the single-layer analog (La, Sr)2CuO4 which has a buckled, distorted CuO2 plane in the superconducting state.

引用

页码：138 / 142

页数：5

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