Structural disorder and charge transfer in the superconductor (Pb0.5Cu0.5)(Sr0.5La0.5) 2CuO5+δ

Nellie R. Khasanova; Fujio Izumi; Minako Shida; Bryan C. Chakoumakos; Eriko Ohshima; Masae Kikuchi; Yasuhiko Syono

doi:10.1016/0921-4534(96)00431-5

Structural disorder and charge transfer in the superconductor (Pb_0.5Cu_0.5)(Sr_0.5La_0.5) ₂CuO_5+δ

Nellie R. Khasanova, Fujio Izumi, Minako Shida, Bryan C. Chakoumakos, Eriko Ohshima, Masae Kikuchi, Yasuhiko Syono

Single Crystal Diffraction

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

5 Scopus citations

Abstract

Two samples of (Pb_0.5Cu_0.5)(Sr_0.5La_0.5) ₂CuO_5+δ with different oxygen contents (δ = 0.03 and 0.13) showed superconducting transition temperatures somewhat different from each other: 24 K for the fully oxidized sample and 35 K for the deoxidized sample. The structural parameters of these samples were refined by the Rietveld analysis of neutron powder diffraction data to clarify the structure/property relationship in this nonstoichiometric oxide. In the oxidized sample, excess oxygen partially occupies an interstitial site at (0.151, 1/2, 0) in a (Pb_0.5Cu_0.5)O_1+δ layer, whereas this site proved to be vacant in the deoxidized sample. All the atoms on this layer are displaced from ideal rock-salt-type positions to achieve more favorable bonding environments. The length of a Cu-O bond on the CuO₂ conduction sheet is decreased from 1.8985 to 1.8915 Å upon oxygen removal. This finding provides unambiguous evidence for the idea that the hole concentration on the CuO₂ sheet increases with releasing excess oxygen from the (Pb_0.5Cu_0.5)O_1+δ layer.

Original language	English
Pages (from-to)	115-123
Number of pages	9
Journal	Physica C: Superconductivity and its Applications
Volume	269
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-4534(96)00431-5
State	Published - Sep 20 1996

Funding

This work was partly supportedb y the STA fellowship (NRK) and a Grant-in-Aidf or Scientific Researcho n Priority Areas, "Science of High-T~ Superconductivityp,r"o videdb y the Ministry of Education,S ciencea nd Culture,J apan (MS, EO, MK and YS). Oak Ridge NationaLl aboratoriys managed by LockheedM artin Energy Researchfo r the U.S. Departmenotf Energy under contractn umberD E-AC05-96OR22464.

Funders	Funder number
Ministry of Education, Culture, Sports, Science and Technology

Keywords

Crystal structure
Neutron diffraction
Oxygen defects

Access to Document

10.1016/0921-4534(96)00431-5

Cite this

@article{1b654e2eb9d442368b1916fb4ae05bbf,

title = "Structural disorder and charge transfer in the superconductor (Pb0.5Cu0.5)(Sr0.5La0.5) 2CuO5+δ",

abstract = "Two samples of (Pb0.5Cu0.5)(Sr0.5La0.5) 2CuO5+δ with different oxygen contents (δ = 0.03 and 0.13) showed superconducting transition temperatures somewhat different from each other: 24 K for the fully oxidized sample and 35 K for the deoxidized sample. The structural parameters of these samples were refined by the Rietveld analysis of neutron powder diffraction data to clarify the structure/property relationship in this nonstoichiometric oxide. In the oxidized sample, excess oxygen partially occupies an interstitial site at (0.151, 1/2, 0) in a (Pb0.5Cu0.5)O1+δ layer, whereas this site proved to be vacant in the deoxidized sample. All the atoms on this layer are displaced from ideal rock-salt-type positions to achieve more favorable bonding environments. The length of a Cu-O bond on the CuO2 conduction sheet is decreased from 1.8985 to 1.8915 {\AA} upon oxygen removal. This finding provides unambiguous evidence for the idea that the hole concentration on the CuO2 sheet increases with releasing excess oxygen from the (Pb0.5Cu0.5)O1+δ layer.",

keywords = "Crystal structure, Neutron diffraction, Oxygen defects",

author = "Khasanova, {Nellie R.} and Fujio Izumi and Minako Shida and Chakoumakos, {Bryan C.} and Eriko Ohshima and Masae Kikuchi and Yasuhiko Syono",

year = "1996",

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doi = "10.1016/0921-4534(96)00431-5",

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T1 - Structural disorder and charge transfer in the superconductor (Pb0.5Cu0.5)(Sr0.5La0.5) 2CuO5+δ

AU - Khasanova, Nellie R.

AU - Izumi, Fujio

AU - Shida, Minako

AU - Chakoumakos, Bryan C.

AU - Ohshima, Eriko

AU - Kikuchi, Masae

AU - Syono, Yasuhiko

PY - 1996/9/20

Y1 - 1996/9/20

N2 - Two samples of (Pb0.5Cu0.5)(Sr0.5La0.5) 2CuO5+δ with different oxygen contents (δ = 0.03 and 0.13) showed superconducting transition temperatures somewhat different from each other: 24 K for the fully oxidized sample and 35 K for the deoxidized sample. The structural parameters of these samples were refined by the Rietveld analysis of neutron powder diffraction data to clarify the structure/property relationship in this nonstoichiometric oxide. In the oxidized sample, excess oxygen partially occupies an interstitial site at (0.151, 1/2, 0) in a (Pb0.5Cu0.5)O1+δ layer, whereas this site proved to be vacant in the deoxidized sample. All the atoms on this layer are displaced from ideal rock-salt-type positions to achieve more favorable bonding environments. The length of a Cu-O bond on the CuO2 conduction sheet is decreased from 1.8985 to 1.8915 Å upon oxygen removal. This finding provides unambiguous evidence for the idea that the hole concentration on the CuO2 sheet increases with releasing excess oxygen from the (Pb0.5Cu0.5)O1+δ layer.

AB - Two samples of (Pb0.5Cu0.5)(Sr0.5La0.5) 2CuO5+δ with different oxygen contents (δ = 0.03 and 0.13) showed superconducting transition temperatures somewhat different from each other: 24 K for the fully oxidized sample and 35 K for the deoxidized sample. The structural parameters of these samples were refined by the Rietveld analysis of neutron powder diffraction data to clarify the structure/property relationship in this nonstoichiometric oxide. In the oxidized sample, excess oxygen partially occupies an interstitial site at (0.151, 1/2, 0) in a (Pb0.5Cu0.5)O1+δ layer, whereas this site proved to be vacant in the deoxidized sample. All the atoms on this layer are displaced from ideal rock-salt-type positions to achieve more favorable bonding environments. The length of a Cu-O bond on the CuO2 conduction sheet is decreased from 1.8985 to 1.8915 Å upon oxygen removal. This finding provides unambiguous evidence for the idea that the hole concentration on the CuO2 sheet increases with releasing excess oxygen from the (Pb0.5Cu0.5)O1+δ layer.

KW - Crystal structure

KW - Neutron diffraction

KW - Oxygen defects

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