Electron microscopy and microanalysis of a YBa2Cu3Ox superconducting oxide

Dou, S. X.; Bourdillon, A. J.; Sorrell, C. C.; Ringer, S. P.; Easterling, K. E.; Savvides, N.; Dunlop, J. B.; Roberts, R. B.
August 1987
Applied Physics Letters;8/17/1987, Vol. 51 Issue 7, p535
Academic Journal
The onset of superconductivity at 140 K has been observed in the high Tc Y-Ba-Cu-O system in samples consisting of 90% by volume of a single-phase oxide of average cation ratio Y:Ba:Cu[bar_over_tilde:_approx._equal_to]1:2:3. A sharp superconducting transition in the resistivity has been measured, where Tc0=140 K, Tc=93.2 K, ΔTc=0.5 K, and ‘‘zero resistance’’ was observed at 92.0 K. Transmission electron microscopy and energy dispersive spectroscopy measurements revealed that the superconducting phase consisted of a large number of microcrystallites of [bar_over_tilde:_approx._equal_to]0.5 μm size and that these contained a very high defect microtwinned/faulted structure.


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