Comparative study on structure and magnetic properties of polycrystalline Pr_xY_{1?span style='font-style: italic'>x}Ba₂Cu₃O_{7?span style='font-style: italic'>¦Ä} prepared in oxygen and argon atmosphe

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• 作者：C. Stari^a ; ^b ; L. Cichetto Jr.^b ; C.H.M.A. Peres^b ; V.A.G. Rivera^c ; S. Sergeenkov^b ; ^{sergei@df.ufscar.br} ; ^{sergei@fisica.ufpb.br} ; C.A. Cardoso^b ; E. Marega^c ; F.M. Araú ; jo-Moreira^b ; ^{faraujo@df.ufscar.br}
• 关键词：Polycrystalline PrxY1&minus ; xBa2Cu3O7&minus ; ¦Ä ; Sol&ndash ; gel method ; Argon gas atmosphere ; Structure ; Magnetic susceptibility ; Critical temperature
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 出版时间：5 July, 2012
• 年：2012
• 卷：528
• 期：Complete
• 页码：135-140
• 全文大小：716 K

文摘

We report a systematic study on the influence of the synthesis routes on the structural and magnetic properties of polycrystalline Pr_xY_1?em>xBa₂Cu₃O_7?em>¦Ä. We have prepared high-quality samples of this material by following a sol-gel method based on heat treatment in both inert argon and oxygen atmospheres in order to compare their effect on the formation of the superconducting phase using X-ray powder diffraction. Magnetic measurements (DC and AC susceptibility) clearly demonstrate that, for the same concentration of Pr, the superconducting transition temperature markedly increases in all samples prepared in argon atmosphere, including pure Pr-123.