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Surface atomic imaging of La2CuO4 and superconducting Tl2Ba2Ca2Cu3O10 |
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| Authors: | W. Zhou D.A. Jefferson W.Y. Liang |
| Affiliation: | a IRC in Superconductivity, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UK b Department of Chemistry, University Chemical Laboratories, Lensfield Road, Cambridge CB2 1EW, UK |
| Abstract: | Surface structures of the high Tc oxide superconductors Tl2Ba2Ca2Cu3O10 and La2CuO4 have been studied by high resolution electron microscopy. In addition to the single atomic layer of La on the (113) surface observed previously, several atomic layers of the C-form of La2O3 were found to coat the (001) surfaces of La2CuO4. Surface reconstruction with the incorporation of excess Ba on the (110) surface of Tl2Ba2Ca2Cu3O10 has been observed together with a stepped (11l) surface produced by a combination of the (110) and (001) planes. The (001) surface of Tl2Ba2Ca2Cu3O10 was also found to terminate with a Ba-O layer. Possible mechanisms for the formation of these surface structures are discussed. |
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