We studied the ac-magnetic response of Co-doped YBa2Cu3O7-d oxide superconductors, YBa2Cu3-xCoxO7-d (x = 0-0.5), in terms of complex susceptibility χ = χ′ - iχ″. The samples were synthesized by the polymerized complex method. We found the onset temperature decreased with increasing x, and for x ≥ 0.4, no superconducting transition was observed down to 5 K. The transition width ΔT(10-90%) for the sample of x = 0.05 is 1.9 K, which is much better than that of the specimens prepared by the ordinary treatment. The transition width was also found to increase as x increases. Details of the experiment are presented together with some discussion of the coupling phase involved.
|ジャーナル||journal of the japan society of powder and powder metallurgy|
|出版ステータス||Published - 1993|
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