Role of bond lengths in the 90-K superconductor: A neutron powder-diffraction study of YBa2Cu3−xCoxO7−y
P. F. Miceli, J. M. Tarascon, L. H. Greene, P. Barboux, F. J. Rotella, J. D. Jorgensen
DOI 10.1103/PhysRevB.37.5932 · Physical Review B
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Abstract
We present the results of a neutron powder-diffraction study on YBa2Cu3−xCoxO7−y. We find that Co preferentially occupies the Cu(1) site, simultaneously attracting extra oxygen into these layers in an amount consistent with Co(III) replacing Cu(II). This compound displays a transition from orthorhombic-to-tetragonal structure for x between 0.05 and 0.1, while Tc decreases continuously and the compound becomes nonsuperconducting for x=0.4. We note several important relationships between bond-length changes, which reflect charge transfer among the ions. Also, we find that Tc changes systematically with the Cu-O bond length.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3-xCoxO7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | midpoint |
| YBa2Cu3-xCoxO7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | midpoint |
| YBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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