Positron annihilation studies in high- Tc superconductors RBa 2Cu 3O y, R: La, Nd, Sm, Eu, Gd, Dy, Ho, Y, Er
Abstract
Positron lifetime and Doppler broadening of the annihilation line measurements have been performed at room temperature in high- Tc 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- Tc 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- Tc superconducting samples.
- Publication:
-
Physics Letters A
- Pub Date:
- February 1997
- DOI:
- 10.1016/S0375-9601(97)00123-0
- Bibcode:
- 1997PhLA..229..259L