Superconductivity of Pr2−xCexCuO4+δ single crystals with substitution of Ni and Co on the Cu position
Matthias Brinkmann, Heinrich Bach, Kurt Westerholt
DOI 10.1103/PhysRevB.54.6680 · Physical Review B
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Abstract
We report magnetic susceptibility, electrical resistivity, and Hall-coefficient measurements on single crystals from the electron-doped high-TC superconductor Pr2−xCexCuO4+δ with Cu replaced by Ni and Co partly. The impurities on the Cu position lead to a strong increase of the residual resistivity of about 450 μΩ cm/at.% substitution, TC is suppressed at a rate of -20 K/at.% substitution for both, Ni and Co, in quantitative agreement with previously published results on polycrystalline samples. We find that the Hall coefficient RH is strongly shifted towards positive values with increasing concentration of Ni and Co, simultaneously the low-temperature upturn in RH(T) is suppressed. This indicates a different impurity scattering rate for the hole and electron type of charge carriers coexisting on the Fermi surface of the electron doped superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pr1.85Ce0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22.9 | Pressure not reported | midpoint |
| Pr1.87Ce0.13Cu0.997Ni0.003O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure not reported | midpoint |
| Pr1.84Ce0.16Cu0.993Ni0.007O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12.2 | Pressure not reported | midpoint |
| Pr1.83Ce0.17Cu0.980Ni0.020O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.1 | Pressure not reported | midpoint |
| Pr1.85Ce0.15Cu0.995Co0.005O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.2 | Pressure not reported | midpoint |
| Nd1.85Ce0.15Cu1-yMyO4 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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