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Structural, electrical, and thermal properties of a series of superconductors Eu $$_{1+x}$$ 1 + x Ba $$_{2-x}$$ 2 - x Cu $$_{3}$$ 3 O $$_{7-\delta }$$ 7 - δ where $$x=0$$ x = 0 , 0.03, 0.05, 0.1, and 0.2 were investigated. According to the X-ray powder diffraction at room temperature, all the samples are single phase. Eu $$_{1+x}$$ 1 + x Ba $$_{2-x}$$ 2 - x Cu $$_{3}$$ 3 O $$_{7-\delta }$$ 7 - δ takes on an orthorhombic–tetragonal (O–T) phase transition for $$x=0.2$$ x = 0.2 . Corresponding to the O–T phase transition, the superconducting critical temperature $$T_{\mathrm{c}}$$ T c decreases rapidly with Eu content. Thermogravimetric analysis was used to investigate the total oxygen content by determining the weight loss in oxygen atmosphere.
Journal of Low Temperature Physics – Springer Journals
Published: Sep 21, 2015
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