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

共 10 条

[1] Nguyen, Er-Rakho, Michel, Choisnet, Raveau, Mat. Res. Bull., 15, (1980)
[2] Cava, Batlogg, van Dover, Krajewski, Waszczak, Fleming, Peck, Rupp, Marsh, James, Schneemeyer, Nature, 345, (1990)
[3] Rietveld, A profile refinement method for nuclear and magnetic structures, Journal of Applied Crystallography, 2, (1969)
[4] Prince, U.S. Tech. Note 1117, pp. 8-9, (1980)
[5] Koester, Yelon, Neutron Diffraction Newsletter, (1983)
[6] Santoro, Beech, Cava, Neutron Powder Diffraction Study of the Structures of La1.9Ca1.1Cu2O6 and La1.9Sr1.1Cu2O6+δ, MRS Proceedings, 166, (1990)
[7] Izumi, Et al., Physica C, 157, (1989)
[8] Caignaert, Nguyen, Raveau, Mat. Res. Bull., 25, (1990)
[9] Cava, Santoro, Johnson, Rhodes, Phys. Rev., 35 B, (1987)
[10] Cava, Hewat, Hewat, Batlogg, Marezio, Rabe, Krajewski, Peck, Rupp, Physica C, 165, (1990)

← 1 →