3d-metal doping of the high-temperature superconducting perovskites La-Sr-Cu-O and Y-Ba-Cu-O
J. M. Tarascon, L. H. Greene, P. Barboux, W. R. McKinnon, G. W. Hull, T. P. Orlando, K. A. Delin, S. Foner, E. J. McNiff, Jr.
DOI 10.1103/PhysRevB.36.8393 · Physical Review B
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Abstract
The structural, magnetic, and superconducting properties of the mixed compounds La1.85Sr0.15Cu1−xMxO4 (0<x<0.3) (M=NiorZn) and YBa2Cu3−xNixO7−y (x=0.25 or 0.5) were studied. dc resistance, meissner, and shielding measurements have shown that both magnetic Ni and diamagnetic Zn ions destroy the superconductivity in the La-Sr-Cu-O system. Within the Y-Ba-Cu-O system, the replacement of copper by nickel depresses Tc from 93 K (x=0) to 50 K (x=0.5). At higher nickel contents, the phase does not form. The upper critical field Bc2(T) of the nickel-doped samples was measured near Tc in dc fields to 23 T. Resistive midpoint transitions yield dBc2dT=4.5 and 1.77 T/K for the Ni-doped La-Sr-Cu-O (x=0.025) and Y-Ba-Cu-O (x=0.5) systems, respectively. We compare doping results for magnetic and nonmagnetic ions, and discuss the origin of the depression in Tc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39.3 | Pressure not reported | midpoint |
| La1.85Sr0.15Cu0.975Ni0.025O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22.6 | Pressure not reported | midpoint |
| La1.85Sr0.15Cu0.95Ni0.05O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.2 | Pressure not reported | midpoint |
| La1.85Sr0.15Cu0.975Zn0.025O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | midpoint |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91.6 | Pressure not reported | midpoint |
| YBa2Cu2.75Ni0.25O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 63.9 | Pressure not reported | midpoint |
| YBa2Cu2.5Ni0.5O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 52.3 | Pressure not reported | midpoint |
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