Abstract

Transition to a superconducting zero-resistance state at 155 K is observed for the first time in bulk material. A new five-element compound has been synthesized with nominal composition Y1Ba2Cu3F2Oy. Fluorine plays a critical role in achieving this effect. X-ray diffraction and electron microprobe analysis indicate that the samples are multiphasic. Evidence is presented that the samples contain superconducting phases with onset temperatures considerably above 155 K. Magnetic measurements suggest a flux-trapping effect below 260 K, and diamagnetic deviations from Curie-Weiss behavior in the range from 250 K≤T≤100 K indicate that Meissner effect in a small superconducting volume fraction.

Original Publication Citation

S.R. Ovshinsky, R.T. Young, David D. Allred, G. DeMaggio, and G.A. Van der Leeden, "Superconductivity at 155 K," Physical Review Letters 58(24), 2579 2581 (1987). [http://link.aps.org/doi/1.113/PhysRevLett.58.2579][1.113/PhysRevLett.58.2579].

Document Type

Peer-Reviewed Article

Publication Date

1987-06-15

Permanent URL

http://hdl.lib.byu.edu/1877/2907

Publisher

American Physical Society

Language

English

College

Physical and Mathematical Sciences

Department

Physics and Astronomy

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