Crystal substructure and physical properties of the superconducting phase Bi4(Sr,Ca)6Cu4O16+x
J. M. Tarascon, Y. Le Page, P. Barboux, B. G. Bagley, L. H. Greene, W. R. McKinnon, G. W. Hull, M. Giroud, D. M. Hwang
DOI 10.1103/PhysRevB.37.9382 · Physical Review B
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Abstract
We have isolated a high-Tc phase in the Bi-Sr-Ca-Cu-O system of composition Bi4(Sr,Ca)6Cu4O16+x. The crystal substructure has a tetragonal unit cell a=3.817 Å, c=30.5 Å) with similarities to both the oxygen-defect perovskites YBa2Cu3O7−x and the K2NiF4 structure of La2CuO4. The oxygen content, determined by titration and thermogravimetric analysis experiments, corresponds to a formal oxidation state Cu(2.15). Oxygen can be reversibly depleted in an argon ambient in an amount corresponding to the reduction of the Cu(III) into Cu(II). The compound has a metalliclike resistance above its Tc near 85 K. Processing this precursor compound by heating to temperatures near its melting point (885 °C) produces a sharp resistivity drop near 110 K that we show by ac susceptibility and Meissner effect is due to a superconducting transition.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi4(Sr,Ca)6Cu4O16+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | unknown |
| Bi4(Sr,Ca)6Cu4O16+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 110 | Pressure not reported | onset |
| Bi4(Sr,Ca)6Cu4O16+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 110 | Pressure not reported | onset |
| BiSrCaCu2Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 105 | Pressure not reported | unknown |
| Bi4Sr3Ca3Cu4Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | unknown |
| Bi4Sr3Ca3Cu4Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 110 | Pressure not reported | unknown |
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