High-Tc superconductivity in three-fluorite-layer copper oxides. II. (Cu,Mo)Sr2(Ce,Y)3Cu2O11+δ
Y. Morita, T. Nagai, Y. Matsui, H. Yamauchi, M. Karppinen
DOI 10.1103/PhysRevB.70.174515 · Physical Review B
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Abstract
We have synthesized high-quality samples of the s=3 member of the (Cu,Mo)−12s2 homologous series of layered copper oxides. The (Cu,Mo)−1232 phase forms as a single phase for the cation composition (Cu0.75Mo0.25)Sr2(Ce0.67Y0.33)3Cu2O11+δ through solid-state synthesis in air, but the samples as synthesized are not superconductive. Superconductivity is induced in the air-synthesized samples by means of high-pressure oxygenation carried out at 5GPa and 500°C in the presence of Ag2O2 as an excess oxygen source. With increasing ratio of Ag2O2 to the (Cu,Mo)−1232 phase the c-axis lattice parameter gradually decreases and Tc increases. The highest Tc value of 53K reached for samples oxygenated in the presence of 100mol% Ag2O2 exceeds the values reported for Cu-based two-fluorite-layer compounds.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Cu0.75Mo0.25)Sr2(Ce0.67Y0.33)3Cu2O11+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 53 | Pressure not reported | onset |
| (Cu0.75Mo0.25)Sr2(Ce0.67Y0.33)3Cu2O11+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 54 | Pressure not reported | midpoint |
| Cu(Ba,R)2(Ce,R)2Cu2O9±δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 43 | Pressure not reported | unknown |
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