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Applied Physics A

, Volume 48, Issue 4, pp 335–341 | Cite as

Positron annihilation at defects in sintered high-Tc perovskite superconductors

  • C. Corbel
  • P. Bernède
  • H. Pascard
  • F. Rullier-Albenque
  • R. Korman
  • J. F. Marucco
Solids and Materials

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.

PACS

78.70Bj 74.70Vy 61.70.-r 

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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • C. Corbel
    • 1
  • P. Bernède
    • 1
  • H. Pascard
    • 2
  • F. Rullier-Albenque
    • 2
  • R. Korman
    • 3
  • J. F. Marucco
    • 4
  1. 1.Centre d'Etudes Nucléaires de SaclayInstitut National des Sciences et Techniques NucléairesGif-sur-YvetteFrance
  2. 2.Section d'Etudes des Solides IrradiésEcole PolytechniquePalaiseauFrance
  3. 3.Laboratoire Central de RecherchesThomson CSFOrsay CedexFrance
  4. 4.Centre d'Orsay, Composés non Stoechiométriques, Unité associée au CNRS 446Université de Paris SudOrsay CedexFrance

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