Superconductivity produced by electron doping in CuO2-layered compounds

H. Takagi, S. Uchida, and Y. Tokura
Phys. Rev. Lett. 62, 1197 – Published 6 March 1989
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Abstract

We have discovered that the Ce4+ doping and subsequent annealing in reducing atmosphere give rise to 24-K superconductivity in the Nd2CuO4-type structure with sheets of Cu-O squares. In contrast to the previously reported high-Tc 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 Tc on the concentration of doped electrons is shown for these electron-doped superconducting suprates.

  • Received 30 January 1989

DOI:https://doi.org/10.1103/PhysRevLett.62.1197

©1989 American Physical Society

Authors & Affiliations

H. Takagi and S. Uchida

  • Engineering Research Institute, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan

Y. Tokura

  • Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan

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Issue

Vol. 62, Iss. 10 — 6 March 1989

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