Temperature dependence of the positron annihilation lifetime in single-crystal YBa2Cu3O7

D. R. Harshman, L. F. Schneemeyer, J. V. Waszczak, Y. C. Jean, M. J. Fluss, R. H. Howell, A. L. Wachs

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Abstract

We report our measurements of the temperature dependence of the positron lifetime spectrum in single-crystal YBa2Cu3O7. Contrary to earlier measurements in sintered powders, we observe only a single lifetime component for temperatures in the range 5<T<297 K, exhibiting a constant value (176 ps) above Tc and increasing monotonically below Tc to 187 ps at 5 K. Possible correlations with the superconducting gap, relaxation of the oxygen atoms, or a redistribution of the electrons are discussed.

Original languageEnglish
Pages (from-to)848-851
Number of pages4
JournalPhysical Review B
Volume38
Issue number1
DOIs
StatePublished - 1 Jan 1988

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