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Title:
Superconductivity at 93 K in a new mixed-phase Y-Ba-Cu-O compound system at ambient pressure
Authors:
Wu, M. K.; Ashburn, J. R.; Torng, C. J.; Hor, P. H.; Meng, R. L.
Affiliation:
AA(Alabama, University, Huntsville, AL), AB(Alabama, University, Huntsville, AL), AC(Alabama, University, Huntsville, AL), AD(Houston, University, TX), AE(Houston, University, TX)
Publication:
Physical Review Letters (ISSN 0031-9007), vol. 58, March 2, 1987, p. 908-910. Research supported by the University of Houston. (PhRvL Homepage)
Publication Date:
03/1987
Category:
Solid-State Physics
Origin:
STI
NASA/STI Keywords:
Atmospheric Pressure, Cryogenics, Electrical Resistance, Superconductivity, Temperature Dependence, Yttrium Compounds, Barium Compounds, Copper Compounds, Cryogenic Equipment, Liquid Nitrogen, Oxygen Compounds
DOI:
10.1103/PhysRevLett.58.908
Bibliographic Code:
1987PhRvL..58..908W

Abstract

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.
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