Superconductivity and microstructure of YSr2Cu3O6.875
O. I. Lebedev, G. Van Tendeloo, F. Licci, E. Gilioli, A. Gauzzi, A. Prodi, M. Marezio
DOI 10.1103/PhysRevB.66.132510 · Physical Review B
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Abstract
The crystal structure of YSr2Cu3O6+x synthesized under high pressure has been studied in detail using transmission electron microscopy and powder neutron diffraction. It has been shown that YSr2Cu3O6+x and YBa2Cu3O6+x are not isostructural after all. The much lower Tc of YSr2Cu3O6+x (YSCO) with respect to that of YBa2Cu3O6+x has to be ascribed to the different structural arrangement of the reservoir blocks. The different oxygen ordering and the consequent displacement of the Sr and Cu1 cations in YSCO yield an orthorhombic modulated structure with a propagation vector of 1/4[012]*. Perfectly ordered YSCO would have an oxygen stoichiometry equal to 6.875. Powder neutron-diffraction data yielded O7.20 and O6.92 for the as-prepared and annealed phases, respectively.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YSr2Cu3O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 56 | Pressure not reported | unknown |
| YSr2Cu3O7.20 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YSr2Cu3O6.92 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La1.85Ba0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | unknown |
| La1.85Ba0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | 1 GPa | unknown |
| La1.9Ba0.1CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | unknown |
| La1.9Ba0.1CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 49 | Pressure not reported | unknown |
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