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Positron annihilation in the hydrogenated granular superconductor of YBa2Cu3O7−δ by C.C. Lam; L.W. Shao; X. Jin; W.M. Chen; H.Q. Xiong; J. Feng; S.R. Qi; K.C. Hung is a Physics and Astronomy article available to read on EtoBox.

What is Positron annihilation in the hydrogenated granular superconductor of YBa2Cu3O7−δ about?

In this paper, we have used the sputtering neutral-particles mass spectroscopy (SNMS) and positron-annihilation technique to investigate the effect of hydrogenation on the physical properties of different oxygenated YBa2Cu307\_ , superconductors. Under the same of hydrogenation treatment, the hydrogenation effects on the superconductors are compared to the non-superconductors. It was shown that the hydrogen concentration in the superconductors is about eight times of the non-superconductor's. It was proven that the long lifetime of positrons in the annihilation process is determined by the variation of the concentrations of monovacancies and microvoids, which takes place in both of intragrain and intergrain samples. The hydrogenation effect can be classified into four stages. At the first stage, the hydrogen atoms fill both monovacancy and microvoid. At the end of the first stage, the long lifetime ~'2 reaches the maximum value which is determined by the lifetime of the positron in the monovacancy-free and nearly microvoid-exhausted YBCO sample. In the second stage, the hydrogen charging will lead to creation of new monovacancies; this will make the long lifetime z 2 drop monotonic

Who reads Positron annihilation in the hydrogenated granular superconductor of YBa2Cu3O7−δ?

Author

C.C. Lam; L.W. Shao; X. Jin; W.M. Chen; H.Q. Xiong; J. Feng; S.R. Qi; K.C. Hung

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0921-4534)

Published

1996

Language

EN

Field

Physics and Astronomy (Physical Sciences)