Percolative superconducting Transition in Y1-xPrxBa2Cu3Oy

M. Muroi, Robert Street

    Research output: Contribution to journalArticle

    20 Citations (Scopus)

    Abstract

    An extensive study has been made of the transport and magnetic properties of the Y1-xPrxBa2Cu3Oy system for a range of compositions (0 less-than-or-equal-to x less-than-or-equal-to 0.6, y almost-equal-to 7). Although the critical temperature T(c) decreases monotonically and smoothly with increasing x, the material shows qualitative changes in properties at a threshold Pr concentration x(cl) almost-equal-to 0.46 before T(c) becomes zero at another threshold x(c2) almost-equal-to 0.58. As x increases towards x(cl), a slight upward deviation from linearity in the resistivity vs. temperature curve begins to appear in a temperature region just above T(c), which suddenly becomes prominent when x exceeds x(cl). The diamagnetic signals, observed both in the field-cooled and zero-field-cooled branches, decrease with increasing x but the decrease is particularly steep when x increases through x(cl). For all the samples studied, small but significant diamagnetism is found to persist up to a temperature region well above T(c) determined from measurements of resistivity. These observations are discussed in terms of a two-dimensional percolation model in which it is assumed that two Pr ions, when they occupy neighbouring rare earth sites, localize a hole on the oxygen sites between them, locally destroying the superconductivity.
    Original languageEnglish
    Pages (from-to)345-364
    JournalPhysica C
    Volume216
    DOIs
    Publication statusPublished - 1993

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    electrical resistivity
    diamagnetism
    thresholds
    Diamagnetism
    Temperature
    linearity
    temperature
    critical temperature
    rare earth elements
    superconductivity
    Superconductivity
    transport properties
    Transport properties
    Rare earths
    magnetic properties
    deviation
    Magnetic properties
    oxygen
    curves
    Ions

    Cite this

    Muroi, M. ; Street, Robert. / Percolative superconducting Transition in Y1-xPrxBa2Cu3Oy. In: Physica C. 1993 ; Vol. 216. pp. 345-364.
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    Percolative superconducting Transition in Y1-xPrxBa2Cu3Oy. / Muroi, M.; Street, Robert.

    In: Physica C, Vol. 216, 1993, p. 345-364.

    Research output: Contribution to journalArticle

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