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Positron annihilation at defects in sintered high-T c perovskite superconductors (1989)

Corbel, C. ; Bernède, P. ; Pascard, H. ; [weitere]

Springer

Applied physics 48 (1989), S. 335-341

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Details

ISSN: 1432-0630

Schlagwort(e): 78.70Bj ; 74.70Vy ; 61.70.-r

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract We report positron lifetime measurements in sintered superconducting YBa2Cu3O7−x and GdBa2Cu3O7−x oxides. It is shown that the thermal behaviour of the positron lifetime spectra strongly depends on the preparation of the ceramics. A lifetime of 190±3 ps is attributed to oxygen deficient regions. Two lifetimes of 251±7 ps and 225 ±5 ps are attributed to a cation vacancy presenting a temperature dependent atomic arrangement. The lifetime transition (251→225ps) occurs during decreases in temperature across the resistivity superconducting transition. This lifetime change indicates that the volume of the cation vacancy decreases in the superconducting state.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00618895

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