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Positron annihilation studies in high-Tcsuperconductors RBa2Cu3Oy, R: La, Nd, Sm, Eu, Gd, Dy, Ho, Y, Er

Authors
Journal
Physics Letters A
0375-9601
Publisher
Elsevier
Publication Date
Volume
229
Issue
4
Identifiers
DOI: 10.1016/s0375-9601(97)00123-0
Keywords
  • Condensed Matter
Disciplines
  • Physics

Abstract

Abstract Positron lifetime and Doppler broadening of the annihilation line measurements have been performed at room temperature in high- T c superconductors RBa 2Cu 3O y , where R: La, Nd, Sm, Eu, Gd, Dy, Ho, Y, Er and 6.9 < y ≤ 7. Doppler broadening of the annihilation line measurements have also been performed in high- T c superconducting samples R RBa 2Cu 3O y , where R: Nd, Sm, Eu, Ho, Y, Er as a function of temperature between 14 K and 293 K. It was observed that the positron lifetime and the S parameter values at room temperature have no obvious trend in their variation from the yttrium substitution by a rare-earth element. It was also observed that the temperature dependence of the positron annihilation parameters is similar in the high- T c superconducting samples.

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