Oxygen stoichiometry and superconductivity in YBa2Cu3O6+x and Pb2Sr2Y1-xCaxO8+δ

M. Marezio; P. Bordet; J. J. Capponi; R. J. Cava; C. Chaillout; J. Chenavas; A. W. Hewat; E. A. Hewat; J. L. Hodeau; P. Strobel

doi:10.1016/0921-4534(89)91026-5

Oxygen stoichiometry and superconductivity in YBa₂Cu₃O_6+x and Pb₂Sr₂Y_1-xCa_xO_8+δ

M. Marezio, P. Bordet, J. J. Capponi, R. J. Cava, C. Chaillout, J. Chenavas, A. W. Hewat, E. A. Hewat, J. L. Hodeau, P. Strobel

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

20 Scopus citations

Abstract

Structural studies of the oxidation process of YBa₂Cu₃O_6+x and Pb₂Sr₂Y_1-x Ca_xO_8+δ reveal that oxygen uptake does not necessarily lead to better superconducting properties. In the former compound oxygen incorporation results in a higher concentration of positive charges (electron holes) which are transferred from the square chains to the pyramidal layers. Powder neutron diffraction data on new samples prepared by the Zr-gettering technique show that the bridging oxygen position is crucial for the charge transfer. Pb₂Sr₂Y_0.5Ca_0.5O₈ is superconducting at 78 K. This transition is suppressed by oxygen uptake. Neutron and electron diffraction show that for δ > 0.5 the additional positive charge are localized on the Pb sublattice as Pb⁴⁺. This localization hinders the charge transfer to the conducting CuO pyramidal layers.

Original language	English (US)
Pages (from-to)	281-284
Number of pages	4
Journal	Physica C: Superconductivity and its applications
Volume	162-164
Issue number	PART 1
DOIs	https://doi.org/10.1016/0921-4534(89)91026-5
State	Published - Dec 1989
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(89)91026-5

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title = "Oxygen stoichiometry and superconductivity in YBa2Cu3O6+x and Pb2Sr2Y1-xCaxO8+δ",

abstract = "Structural studies of the oxidation process of YBa2Cu3O6+x and Pb2Sr2Y1-x CaxO8+δ reveal that oxygen uptake does not necessarily lead to better superconducting properties. In the former compound oxygen incorporation results in a higher concentration of positive charges (electron holes) which are transferred from the square chains to the pyramidal layers. Powder neutron diffraction data on new samples prepared by the Zr-gettering technique show that the bridging oxygen position is crucial for the charge transfer. Pb2Sr2Y0.5Ca0.5O8 is superconducting at 78 K. This transition is suppressed by oxygen uptake. Neutron and electron diffraction show that for δ > 0.5 the additional positive charge are localized on the Pb sublattice as Pb4+. This localization hinders the charge transfer to the conducting CuO pyramidal layers.",

author = "M. Marezio and P. Bordet and Capponi, {J. J.} and Cava, {R. J.} and C. Chaillout and J. Chenavas and Hewat, {A. W.} and Hewat, {E. A.} and Hodeau, {J. L.} and P. Strobel",

year = "1989",

month = dec,

doi = "10.1016/0921-4534(89)91026-5",

language = "English (US)",

volume = "162-164",

pages = "281--284",

journal = "Physica C: Superconductivity and its Applications",

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T1 - Oxygen stoichiometry and superconductivity in YBa2Cu3O6+x and Pb2Sr2Y1-xCaxO8+δ

AU - Marezio, M.

AU - Bordet, P.

AU - Capponi, J. J.

AU - Cava, R. J.

AU - Chaillout, C.

AU - Chenavas, J.

AU - Hewat, A. W.

AU - Hewat, E. A.

AU - Hodeau, J. L.

AU - Strobel, P.

PY - 1989/12

Y1 - 1989/12

N2 - Structural studies of the oxidation process of YBa2Cu3O6+x and Pb2Sr2Y1-x CaxO8+δ reveal that oxygen uptake does not necessarily lead to better superconducting properties. In the former compound oxygen incorporation results in a higher concentration of positive charges (electron holes) which are transferred from the square chains to the pyramidal layers. Powder neutron diffraction data on new samples prepared by the Zr-gettering technique show that the bridging oxygen position is crucial for the charge transfer. Pb2Sr2Y0.5Ca0.5O8 is superconducting at 78 K. This transition is suppressed by oxygen uptake. Neutron and electron diffraction show that for δ > 0.5 the additional positive charge are localized on the Pb sublattice as Pb4+. This localization hinders the charge transfer to the conducting CuO pyramidal layers.

AB - Structural studies of the oxidation process of YBa2Cu3O6+x and Pb2Sr2Y1-x CaxO8+δ reveal that oxygen uptake does not necessarily lead to better superconducting properties. In the former compound oxygen incorporation results in a higher concentration of positive charges (electron holes) which are transferred from the square chains to the pyramidal layers. Powder neutron diffraction data on new samples prepared by the Zr-gettering technique show that the bridging oxygen position is crucial for the charge transfer. Pb2Sr2Y0.5Ca0.5O8 is superconducting at 78 K. This transition is suppressed by oxygen uptake. Neutron and electron diffraction show that for δ > 0.5 the additional positive charge are localized on the Pb sublattice as Pb4+. This localization hinders the charge transfer to the conducting CuO pyramidal layers.

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U2 - 10.1016/0921-4534(89)91026-5

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VL - 162-164

SP - 281

EP - 284

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - PART 1

ER -

Oxygen stoichiometry and superconductivity in YBa₂Cu₃O_6+x and Pb₂Sr₂Y_1-xCa_xO_8+δ

Abstract

All Science Journal Classification (ASJC) codes

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