Superconductivity at 93 K in a new mixed-phase Y-Ba-Cu-O compound system at ambient pressure

A stable and reproducible superconductivity transition between 80 and 93 K has been achieved and maintained in a Y-Ba-Cu-O compound system at ambient pressure in a simple liquid-nitrogen Dewar. An upper critical field Hc2(0) estimate of between 80 and 180 T is obtained, and the paramagnetic limiting...

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Bibliographic Details
Published in:Physical review letters 1987-03, Vol.58 (9), p.908-910
Main Authors: Wu, M. K., Ashburn, J. R., Torng, C. J., Hor, P. H., Meng, R. L.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Occurrence, potential candidates
Physics
Solid-State Physics
Superconductivity
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Summary:A stable and reproducible superconductivity transition between 80 and 93 K has been achieved and maintained in a Y-Ba-Cu-O compound system at ambient pressure in a simple liquid-nitrogen Dewar. An upper critical field Hc2(0) estimate of between 80 and 180 T is obtained, and the paramagnetic limiting field at 0 K for a sample with a T(c) of about 90 K is 165 T. It is suggested that the lattice parameters, the valence ratio, and the sample treatments all play a role in achieving superconductivity above 77 K.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.58.908