Electrical transport and superconductivity in the Al2O3-Bi2Sr1.8Ca1.2Cu2Oy and MgO-Bi2Sr1.8Ca1.2Cu2Oy composites

Juhn-Jong Lin*, W. Y. Lin, R. F. Tsui

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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We have measured the resistivities ρ{variant} of Al2O3-Bi2Sr1.8Ca1.2Cu2Oy and MgO-Bi2Sr1.8Ca1.2Cu2Oy composites with the nominal Bi2Sr1.8Ca1.2Cu2Oy volume fraction, ρ{variant}2212, ranging from 0.15 to 1.00. For the Al2O3-Bi2Sr1.8Ca1.2Cu 2Oy composites, we find for the samples with ρ{variant}2212≥0.6 that the superconducting transition temperature, Tc, is not disturbed by the addition of Al2O3. For ρ{variant}2212<0.3, no zero-resistivity state is observed. For the MgO-Bi2Sr1.8Ca1.2Cu2Oy composites, Tc is barely disturbed for the samples with ρ2212≥0.7. No superconducting state is observed for the samples with ρ2212<0.35. The variation of ρ{variant}(300 K) with ρ2212 indicates a three-dimensional percolating Bi-Sr-Ca-Cu-O matrix occurring at ρ2212≈0.19 and ≈0.15 in Al2O3-Bi2Sr1.8Ca1.2 Cu2Oy and MgO-Bi2Sr1.8Ca1.2Cu2Oy, respectively. Both resistivity and magnetization measurements suggest that the reactions of Bi2Sr1.8Ca1.2Cu2Oy with MgO are weaker than with Al2O3.

Original languageEnglish
Pages (from-to)455-462
Number of pages8
JournalPhysica C: Superconductivity and its applications
Issue number3-4
StatePublished - 1 Jun 1993

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