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Superconductivity produced by electron doping in CuO/sub 2/-layered compounds

Journal Article · · Phys. Rev. Lett.; (United States)

We have discovered that the Ce/sup 4+/ doping and subsequent annealing in reducing atmosphere give rise to 24-K superconductivity in the Nd/sub 2/CuO/sub 4/-type structure with sheets of Cu-O squares. In contrast to the previously reported high-T/sub c/ cuprates, the charge carriers in the new superconductors are doped electrons, not holes; this was confirmed by the measurements of Hall and Seebeck coefficients as well as by chemical analysis of the effective copper valence. An anomalous dependence of T/sub c/ on the concentration of doped electrons is shown for these electron-doped superconducting cuprates.

Research Organization:
Engineering Research Institute, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan
OSTI ID:
6479734
Journal Information:
Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 62:10; ISSN PRLTA
Country of Publication:
United States
Language:
English