The crystal structure of the La1.6Sr0.4CaCu2O6±δ superconductor

R. J. Cava; A. Santoro; J. J. Krajewski; R. M. Fleming; J. V. Waszczak; W. F. Peck; P. Marsh

doi:10.1016/0921-4534(90)90652-U

The crystal structure of the La_1.6Sr_0.4CaCu₂O_6±δ superconductor

R. J. Cava, A. Santoro, J. J. Krajewski, R. M. Fleming, J. V. Waszczak, W. F. Peck, P. Marsh

Research output: Contribution to journal › Article › peer-review

57 Scopus citations

Abstract

The crystal structure of the La_1.6Sr_0.4CaCu₂O_6±δ superconductor has been determined by neutron diffraction powder profile refinement at room temperature on a slightly oxygen deficient sample (δ=-0.06, T_c=55 K). The crystal structure is very similar to that of the nonsuperconducting host compound La_1.9Ca_1.1Cu₂O_6-δ. 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.

Original language	English (US)
Pages (from-to)	138-142
Number of pages	5
Journal	Physica C: Superconductivity and its applications
Volume	172
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-4534(90)90652-U
State	Published - Dec 1 1990
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/0921-4534(90)90652-U

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title = "The crystal structure of the La1.6Sr0.4CaCu2O6±δ superconductor",

abstract = "The crystal structure of the La1.6Sr0.4CaCu2O6±δ superconductor has been determined by neutron diffraction powder profile refinement at room temperature on a slightly oxygen deficient sample (δ=-0.06, Tc=55 K). The crystal structure is very similar to that of the nonsuperconducting host compound La1.9Ca1.1Cu2O6-δ. 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.",

author = "Cava, {R. J.} and A. Santoro and Krajewski, {J. J.} and Fleming, {R. M.} and Waszczak, {J. V.} and Peck, {W. F.} and P. Marsh",

year = "1990",

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doi = "10.1016/0921-4534(90)90652-U",

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T1 - The crystal structure of the La1.6Sr0.4CaCu2O6±δ superconductor

AU - Cava, R. J.

AU - Santoro, A.

AU - Krajewski, J. J.

AU - Fleming, R. M.

AU - Waszczak, J. V.

AU - Peck, W. F.

AU - Marsh, P.

PY - 1990/12/1

Y1 - 1990/12/1

N2 - The crystal structure of the La1.6Sr0.4CaCu2O6±δ superconductor has been determined by neutron diffraction powder profile refinement at room temperature on a slightly oxygen deficient sample (δ=-0.06, Tc=55 K). The crystal structure is very similar to that of the nonsuperconducting host compound La1.9Ca1.1Cu2O6-δ. 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.

AB - The crystal structure of the La1.6Sr0.4CaCu2O6±δ superconductor has been determined by neutron diffraction powder profile refinement at room temperature on a slightly oxygen deficient sample (δ=-0.06, Tc=55 K). The crystal structure is very similar to that of the nonsuperconducting host compound La1.9Ca1.1Cu2O6-δ. 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.

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The crystal structure of the La_1.6Sr_0.4CaCu₂O_6±δ superconductor

Abstract

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