Evidence Suggesting Superconductivity at 250 K in a Sequentially Deposited Cuprate Film

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Science  17 Dec 1993:
Vol. 262, Issue 5141, pp. 1850-1852
DOI: 10.1126/science.262.5141.1850


An artificial cuprate compound belonging to the BiSrCaCuO family with eight adjacent sequetially imposed layer epitaxy. This compound undergoes a five order of magnitude resistivity drop with an onset near 280 kelvin and an offset at 250 kelvin. It exhibits a diamagnetic variation of susceptibility and magnetization below 290 kelvin. Additional observed features, such as strongly nonlinear conductivity, suggests superconductivity as a plausible explanation of the properties of this compound.