New high-temperature superconductor, Y–Ba–Cu–O

Luo, Y. L.; Morrish, A. H.; Pankhurst, QA; Pelletier, Gerald; Roy, G.; Zhang, D. Y.; Zhou, X. Z.

doi:10.1139/p87-056

Cited by 5 publications

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“…After the publication of a report that superconductivity occurred in an oxide near 90K (l), the compound with the nominal composition YBa2C~307-r has been identified as the phase responsible by several laboratories around the world (2), including our own (3). In the absence of appreciably sized single crystals, we made polycrystalline ceramics with superior superconducting properties.…”

Section: Introductionmentioning

confidence: 99%

Diamagnetic and structural characterization of orthorhombic high-temperature superconductors in the system Y–Ba–Cu–O

Raudsepp¹,

Hawthorne²,

Zhou³

et al. 1987

Can. J. Phys.

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Ceramic samples of the 90 K superconductor with nominal composition YBa2Cu307-, were made under varying preparation conditions. Some samples have a narrow transition-temperature range of about 1.5 K and a 100% "ac Meissner effect" near 77 K. The magnetic losses below 85 K were much reduced in these samples. Rietveld structure refinement in space group Pmmm using powder X-ray diffraction data showed significant oxygen vacancies in the square-planar CuOz chains parallel to the y axis in the y-z plane, and Cu disorder about the origin along the x axis. The sample with the superior superconducting properties has the formula YBa2C~306,92.

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Section: Introductionmentioning

confidence: 99%