ELECTRONIC BEHAVIOR OF YBACUO(123) SUPERCONDUCTORS WITH VARYING OXYGEN-CONTENT STUDIED BY POSITRON-LIFETIME SPECTRUM

Authors
ZHANG JC LIU FQ LIU JZ CAO SX GUO HS
Citation
Jc. Zhang et al., ELECTRONIC BEHAVIOR OF YBACUO(123) SUPERCONDUCTORS WITH VARYING OXYGEN-CONTENT STUDIED BY POSITRON-LIFETIME SPECTRUM, Applied superconductivity, 1(7-9), 1993, pp. 1055-1060
Citations number
13
Categorie Soggetti
Material Science","Physics, Applied","Physics, Condensed Matter
Journal title
Applied superconductivity → ACNP
ISSN journal
09641807
Volume
1
Issue
7-9
Year of publication
1993
Pages
1055 - 1060
Database
ISI
SICI code
0964-1807(1993)1:7-9<1055:EBOYSW>2.0.ZU;2-Q
Abstract
The series samples of YBa2Cu3Ox with varying oxygen content(6.3 < x < 7) was studied by positron lifetime spectrum. By combining the results of positron with Tc and x-ray diffraction experiment, we get the evid ence of positron-lifetime spectrum for the orthorhombic to tetragonal phase transition. The results show that the phase transition is a grad ual changing process, in which the local electronic density have a lar ge decreased and oxygen-vacancy have a large fluctuation which introdu ced a phase transition instability.