Superconducting transitions of LuBa2Cu3O7-z heated under various atmospheres

다국어 초록 (Multilingual Abstract)

The influence of quenching temperature, heating atmosphere and annealing time on superconducting characteristics has beenstudied for LuBa2Cu3O7-z compound which has been recently synthesized in a nearly phase-pure form. Resistivity measurementsfor the as-prepared sample heated at 300 °C in oxygen and subsequently quenched into liquid nitrogen revealed that there is nosignificant change in Tc. On the other hand, Tc of the sample slightly increased when the sample was heated at 300 °C either in airor in N2 atmosphere. It was also found that Tc of the sample decreased when the annealing temperature in N2 atmosphere increasedabove 400 °C. The experimental results indicated that the as-prepared sample is under overdoped state. The enhancedsuperconducting transition observed in the samples after heating at 300 °C in air or N2 atmosphere was discussed in conjunctionwith a slight removal of oxygen and ordering of oxygen atoms in the as-prepared sample

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