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Positron annihilation in hydrogenated YBCO superconductor

Journal Article


Abstract


  • The behaviour of hydrogenated YBa2Cu3Oy(YBCO) has been investigated by sputtering neutral-particle mass spectrometry (SNMS) and positron annihilation lifetime spectrum analysis. SNMS analysis shows that hydrogen in YBCO is in the covalent form. In order to interpret experimental results, a hydrogenation model is suggested in which hydrogen occupies sites H1, H2 and H3 where H1 is in the CuO chains and H2 and H3 are in the plane occupied by Y. To study the two positron annihilation lifetimes ��1 and ��2, the electronic densities in special "rooms" the unit cell of YBCO, which are relative to H1, H2 and H3 were calculated. The results show that the process of ��1 occurs in the "room" where barium is located, and that of ��2 is decided by the hydrogen occupied sites H2 and H3. The variation of ��2 following hydrogenation is considered to be a result of hydrogen occupying H2 and then diffusing to H1. �� 1998 Kluwer Academic Publishers. * Author to whom all correspondence should be addressed.

Publication Date


  • 1998

Citation


  • Chen, W. M., Jiang, S. S., Li, L. Y., Shen, K., Wu, X. S., Jin, X., . . . Shao, L. W. (1998). Positron annihilation in hydrogenated YBCO superconductor. Journal of Materials Science, 33(14), 3623-3628. doi:10.1023/A:1004659430020

Scopus Eid


  • 2-s2.0-0032108917

Web Of Science Accession Number


Start Page


  • 3623

End Page


  • 3628

Volume


  • 33

Issue


  • 14

Place Of Publication


Abstract


  • The behaviour of hydrogenated YBa2Cu3Oy(YBCO) has been investigated by sputtering neutral-particle mass spectrometry (SNMS) and positron annihilation lifetime spectrum analysis. SNMS analysis shows that hydrogen in YBCO is in the covalent form. In order to interpret experimental results, a hydrogenation model is suggested in which hydrogen occupies sites H1, H2 and H3 where H1 is in the CuO chains and H2 and H3 are in the plane occupied by Y. To study the two positron annihilation lifetimes ��1 and ��2, the electronic densities in special "rooms" the unit cell of YBCO, which are relative to H1, H2 and H3 were calculated. The results show that the process of ��1 occurs in the "room" where barium is located, and that of ��2 is decided by the hydrogen occupied sites H2 and H3. The variation of ��2 following hydrogenation is considered to be a result of hydrogen occupying H2 and then diffusing to H1. �� 1998 Kluwer Academic Publishers. * Author to whom all correspondence should be addressed.

Publication Date


  • 1998

Citation


  • Chen, W. M., Jiang, S. S., Li, L. Y., Shen, K., Wu, X. S., Jin, X., . . . Shao, L. W. (1998). Positron annihilation in hydrogenated YBCO superconductor. Journal of Materials Science, 33(14), 3623-3628. doi:10.1023/A:1004659430020

Scopus Eid


  • 2-s2.0-0032108917

Web Of Science Accession Number


Start Page


  • 3623

End Page


  • 3628

Volume


  • 33

Issue


  • 14

Place Of Publication