Direct imaging of the oxygen sublattice in YBa2Cu3O7−δ superconductors by high-resolution electron microscopy
Y. Yan, M. G. Blanchin
DOI 10.1103/PhysRevB.43.13717 · Physical Review B
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Abstract
Direct imaging of the oxygen sublattice in high-Tc YBa2Cu3O7−δ superconductors by means of high-resolution transmission electron microscopy (HREM) has appeared difficult to achieve experimentally. Here are presented experimental HREM images along both the a and the b directions of the structure, which have been obtained from thin crystals observed at 400 kV near the Scherzer defocus condition. In such micrographs the occupied oxygen columns are imaged as black dots clearly visible between the darker metal dots, whereas the oxygen vacancy columns are seen as bright dots. Thus, the [100] and [010] projections of the structure can be distinguished directly from the experimental HREM image. These direct structural images of the oxygen sublattice are consistent with the corresponding simulated images calculated on the basis of the YBa2Cu3O7 orthorhombic structure proposed in the literature.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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