A comparative study of Pr substitution at Y and Ba sites in YBa2Cu3O7-delta

作者：Singhal R K^*

来源：Materials Letters, 2011, 65(5): 825-827.

DOI：10.1016/j.matlet.2010.12.009

• Ceramics
• X-ray techniques
• Superconductors

Aimed at identifying the factors which suppress the superconductivity in cuprate perovskites I have investigated the effect of substituting Pr ions at the Y and Ba sites in YBa2Cu3O7-delta system using structural, transport, iodometric, and photoemission studies. The rate of Tc depression in the case when Pr substitutes the Ba site is much higher than the case when it substitutes the Y. This is explained as being due to a combined effect of the factors such as depletion of itinerant holes due to depletion of the oxygen content, the Pr 4f-O 2p hybridization, shortening of c-axis causing Cooper pair-breaking, and the loss of orthorhombicity.

• 出版日期2011-3-15