Oxygen-defect structure of non-superconducting La1.85Sr1.15Cu2O6.25: excess oxygen in the interlayer site

P. Lightfoot; Shiyou Pei; J. D. Jorgensen; X. X. Tang; A. Manthiram; J. B. Goodenough

doi:10.1016/0921-4534(90)90593-4

Oxygen-defect structure of non-superconducting La_1.85Sr_1.15Cu₂O_6.25: excess oxygen in the interlayer site

P. Lightfoot^*, Shiyou Pei, J. D. Jorgensen, X. X. Tang, A. Manthiram, J. B. Goodenough

^*Corresponding author for this work

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

Abstract

The structure of the metallic, but nonsuperconducting, double-layer phase, La_1.85Sr_1.15Cu₂O_6.25 has been refined from neutron powder diffraction data; space group 14/mmm, a=3.8530(1) A ̊, c=20.0833 (3) A ̊. Sr²⁺ ions are ordered predominantly into the nine-coordinated site in the T-type layer of the structure. Occupation of the interlayer site by the relatively large La³⁺/Sr²⁺ ions allows intercalation of the excess oxygen at the (0, 0, case1 2) site between the CuO₂ layers. In addition, vacancies are introduced in the O(1) sites of the CuO₂ planes. This partial destruction of the two-dimensional nature of the structure may be responsible for the lack of superconductivity in this phase, in contrast to the recent observation of a T_c of 60 K in the similarly-doped calcium phase La_1.6Sr_0.4CaCu₂O₆.

Original language	English
Pages (from-to)	464-468
Number of pages	5
Journal	Physica C: Superconductivity and its applications
Volume	169
Issue number	5-6
DOIs	https://doi.org/10.1016/0921-4534(90)90593-4
Publication status	Published - 15 Aug 1990

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title = "Oxygen-defect structure of non-superconducting La1.85Sr1.15Cu2O6.25: excess oxygen in the interlayer site",

abstract = "The structure of the metallic, but nonsuperconducting, double-layer phase, La1.85Sr1.15Cu2O6.25 has been refined from neutron powder diffraction data; space group 14/mmm, a=3.8530(1) A ̊, c=20.0833 (3) A ̊. Sr2+ ions are ordered predominantly into the nine-coordinated site in the T-type layer of the structure. Occupation of the interlayer site by the relatively large La3+/Sr2+ ions allows intercalation of the excess oxygen at the (0, 0, case1 2) site between the CuO2 layers. In addition, vacancies are introduced in the O(1) sites of the CuO2 planes. This partial destruction of the two-dimensional nature of the structure may be responsible for the lack of superconductivity in this phase, in contrast to the recent observation of a Tc of 60 K in the similarly-doped calcium phase La1.6Sr0.4CaCu2O6.",

author = "P. Lightfoot and Shiyou Pei and Jorgensen, {J. D.} and Tang, {X. X.} and A. Manthiram and Goodenough, {J. B.}",

year = "1990",

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doi = "10.1016/0921-4534(90)90593-4",

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T1 - Oxygen-defect structure of non-superconducting La1.85Sr1.15Cu2O6.25

T2 - excess oxygen in the interlayer site

AU - Lightfoot, P.

AU - Pei, Shiyou

AU - Jorgensen, J. D.

AU - Tang, X. X.

AU - Manthiram, A.

AU - Goodenough, J. B.

PY - 1990/8/15

Y1 - 1990/8/15

N2 - The structure of the metallic, but nonsuperconducting, double-layer phase, La1.85Sr1.15Cu2O6.25 has been refined from neutron powder diffraction data; space group 14/mmm, a=3.8530(1) A ̊, c=20.0833 (3) A ̊. Sr2+ ions are ordered predominantly into the nine-coordinated site in the T-type layer of the structure. Occupation of the interlayer site by the relatively large La3+/Sr2+ ions allows intercalation of the excess oxygen at the (0, 0, case1 2) site between the CuO2 layers. In addition, vacancies are introduced in the O(1) sites of the CuO2 planes. This partial destruction of the two-dimensional nature of the structure may be responsible for the lack of superconductivity in this phase, in contrast to the recent observation of a Tc of 60 K in the similarly-doped calcium phase La1.6Sr0.4CaCu2O6.

AB - The structure of the metallic, but nonsuperconducting, double-layer phase, La1.85Sr1.15Cu2O6.25 has been refined from neutron powder diffraction data; space group 14/mmm, a=3.8530(1) A ̊, c=20.0833 (3) A ̊. Sr2+ ions are ordered predominantly into the nine-coordinated site in the T-type layer of the structure. Occupation of the interlayer site by the relatively large La3+/Sr2+ ions allows intercalation of the excess oxygen at the (0, 0, case1 2) site between the CuO2 layers. In addition, vacancies are introduced in the O(1) sites of the CuO2 planes. This partial destruction of the two-dimensional nature of the structure may be responsible for the lack of superconductivity in this phase, in contrast to the recent observation of a Tc of 60 K in the similarly-doped calcium phase La1.6Sr0.4CaCu2O6.

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JO - Physica C: Superconductivity and its applications

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Oxygen-defect structure of non-superconducting La_1.85Sr_1.15Cu₂O_6.25: excess oxygen in the interlayer site

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