Neutron powder diffraction study on Eu-substituted Bi2Sr2CaCu2O8+y high temperature superconductor

Olli Antson, Tarja Karlemo, Maarit Karppinen, Kari Ullakko

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    Abstract

    We have used a neutron powder diffraction method to study the structural changes in the Bi2Sr2Ca1−xEuxCu2O8+y compound caused by the partial substitution of Ca by Eu. Besides the systematic variation of the parameters of the orthorhombic 5.4 ÅX5.4 ÅX30.7 Å sub-cell, we observed atomic rearrangement in the BiO-layer and modifications in the square-pyramidal coordination polyhedra of the Cu ion. The onset temperature Tonset as determined by the AC susceptibility method has a broad maximum at x = 0.3, and no superconductivity is observed at x = 0.6 in the temperature range T > 4.2 K. We discuss also about the reasons for the broadening of the transition range and the decrease of the Meissner fraction concomitant to the increase of the Eu concentration.

    Original languageEnglish
    Pages (from-to)65 - 74
    Number of pages10
    JournalPhysica C: Superconductivity and its Applications
    Volume173
    Issue number1-2
    DOIs
    Publication statusPublished - 1991
    MoE publication typeA1 Journal article-refereed

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