Kondo effect and superconductivity in Nd2−xCexCuO4−δ compounds
J. L. Peng, R. N. Shelton, H. B. Radousky
DOI 10.1103/PhysRevB.41.187 · Physical Review B
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Abstract
Samples of Nd2−xCexCuO4−δ (0≤x≤0.2) were prepared by annealing both in air and under vacuum (10−5 Torr). Powder x-ray-diffraction patterns indicated that all samples consisted of a single-phase Nd2CuO4-type tetragonal structure with crystal symmetry I4/mmm. Electrical resistivity measurements showed that all Ce-doped Nd2CuO4−δ samples annealed in air and those annealed in vacuum with x<0.17 demonstrate a resistivity minimum (Kondo effect) resulting from the combination of magnetic and phonon scattering. Magnetic susceptibility and electrical resistivity measurements reflect the influence of crystal-field effects below 55 K. The linear temperature-dependent term of the resistivity typical of metallic behavior in the high-Tc oxides exists across the whole range of Ce concentration, with the exception of the host compound Nd2CuO4−δ, which is an insulator. This indicates that a model of metal-insulator transition is not appropriate in describing the occurrence of superconductivity in Nd2−xCexCuO4−δ.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nd2-xCexCuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nd2-xCexCuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nd2-xThxCuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Pr2-xThxCuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Eu2-xCexCuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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