Positron annihilation at defects in sintered high-Tc perovskite superconductors

C. Corbel; P. Bernède; H. Pascard; F. Rullier-Albenque; R. Korman; J. F. Marucco

doi:10.1007/BF00618895

Positron annihilation at defects in sintered high-T_c perovskite superconductors

C. Corbel
, P. Bernède
, H. Pascard
, F. Rullier-Albenque
, R. Korman
, J. F. Marucco

Institut Pierre Simon Laplace, CNRS and CEA
Section d'Etudes des Solides Irradiés
Thomson-CSF
Thales Group
Centre d'Orsay, Composés non Stoechiométriques
Centre national de la recherche scientifique

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

29 Citations (Scopus)

Abstract

We report positron lifetime measurements in sintered superconducting YBa₂Cu₃O_7-x and GdBa₂Cu₃O_7-x oxides. It is shown that the thermal behaviour of the positron lifetime spectra strongly depends on the preparation of the ceramics. A lifetime of 190±3 ps is attributed to oxygen deficient regions. Two lifetimes of 251±7 ps and 225 ±5 ps are attributed to a cation vacancy presenting a temperature dependent atomic arrangement. The lifetime transition (251→225ps) occurs during decreases in temperature across the resistivity superconducting transition. This lifetime change indicates that the volume of the cation vacancy decreases in the superconducting state.

Original language	English
Pages (from-to)	335-341
Number of pages	7
Journal	Applied Physics A Solids and Surfaces
Volume	48
Issue number	4
DOIs	https://doi.org/10.1007/BF00618895
Publication status	Published - 1 Apr 1989
Externally published	Yes

Keywords

61.70.-r
74.70Vy
78.70Bj

Access to Document

10.1007/BF00618895

Cite this

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title = "Positron annihilation at defects in sintered high-Tc perovskite superconductors",

abstract = "We report positron lifetime measurements in sintered superconducting YBa2Cu3O7-x and GdBa2Cu3O7-x oxides. It is shown that the thermal behaviour of the positron lifetime spectra strongly depends on the preparation of the ceramics. A lifetime of 190±3 ps is attributed to oxygen deficient regions. Two lifetimes of 251±7 ps and 225 ±5 ps are attributed to a cation vacancy presenting a temperature dependent atomic arrangement. The lifetime transition (251→225ps) occurs during decreases in temperature across the resistivity superconducting transition. This lifetime change indicates that the volume of the cation vacancy decreases in the superconducting state.",

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T1 - Positron annihilation at defects in sintered high-Tc perovskite superconductors

AU - Corbel, C.

AU - Bernède, P.

AU - Pascard, H.

AU - Rullier-Albenque, F.

AU - Korman, R.

AU - Marucco, J. F.

PY - 1989/4/1

Y1 - 1989/4/1

N2 - We report positron lifetime measurements in sintered superconducting YBa2Cu3O7-x and GdBa2Cu3O7-x oxides. It is shown that the thermal behaviour of the positron lifetime spectra strongly depends on the preparation of the ceramics. A lifetime of 190±3 ps is attributed to oxygen deficient regions. Two lifetimes of 251±7 ps and 225 ±5 ps are attributed to a cation vacancy presenting a temperature dependent atomic arrangement. The lifetime transition (251→225ps) occurs during decreases in temperature across the resistivity superconducting transition. This lifetime change indicates that the volume of the cation vacancy decreases in the superconducting state.

AB - We report positron lifetime measurements in sintered superconducting YBa2Cu3O7-x and GdBa2Cu3O7-x oxides. It is shown that the thermal behaviour of the positron lifetime spectra strongly depends on the preparation of the ceramics. A lifetime of 190±3 ps is attributed to oxygen deficient regions. Two lifetimes of 251±7 ps and 225 ±5 ps are attributed to a cation vacancy presenting a temperature dependent atomic arrangement. The lifetime transition (251→225ps) occurs during decreases in temperature across the resistivity superconducting transition. This lifetime change indicates that the volume of the cation vacancy decreases in the superconducting state.

KW - 61.70.-r

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KW - 78.70Bj

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VL - 48

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EP - 341

JO - Applied Physics A Solids and Surfaces

JF - Applied Physics A Solids and Surfaces

IS - 4