Surface structural chemistry of high Tc superconductors by HREM

W ZHOU, W Y LIANG, D A JEFFERSON

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1 Citation (Scopus)

Abstract

Surface structural chemistry of various high Tc superconductors was investigated by high resolution electron microscopy. Surface decomposition was commonly found on the crystals. However, clean surfaces could be generated by electron beam annealing. The (001) surfaces of all the compounds investigated appeared to be terminated with non-superconducting layers. In HgBa2CuO4+delta, the original (001) surface was found to be covered by disordered BaO and CuO with a 2:1 ratio of Ba:Cu as detected by energy dispersive X-ray microanalysis. This disordered coating recrystallized into Ba2CuO3 microcrystals and became intergrown with the bulk HgBa2CuO4-delta following electron beam irradiation.

Original languageEnglish
Pages (from-to)795-796
Number of pages2
JournalPhysica C: Superconductivity
Volume235-240
Issue number2
DOIs
Publication statusPublished - Dec 1994

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