Superconductivity produced by electron doping in CuO2-layered compounds

H. Takagi; S. Uchida; Y. Tokura

doi:10.1103/PhysRevLett.62.1197

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Superconductivity produced by electron doping in CuO2-layered compounds

H. Takagi, S. Uchida, Y. Tokura

DOI 10.1103/PhysRevLett.62.1197 · Physical Review Letters

T1

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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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nd2-xCexCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	24	Pressure not reported	onset
Nd1.85Ce0.15CuO3.96 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	24	Pressure not reported	onset
Nd1.85Ce0.15CuO3.96 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	20	Pressure not reported	zero_resistance
Nd2-xCexCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	24	Pressure not reported	onset