The Effects of Nonstoichiometry in High - T_c Superconducting Properties of YBa_2Cu_{3 + x}O_{7 - \delta}


Abstract: Polycrystalline samples of high T_c superconductor YBa_2Cu_{3 + x}O_{7 - \delta} with 0 \leqslant x \leqslant 0.5 were grown. The effects of nonstoichiometry on the resistance slope above transition temperature T_c and X-ray diffraction patterns for these samples were investigated. In the diffraction patterns obtained, apart from some new features in the peaks, these polycrystalline samples show predominantly 123 phase.

Keywords: Effects of nonstoichiometry, high T_c superconductor, polycrystalline samples.

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