Structure and properties of (Sr,Ca)CuO2–BaCuO2 superlattices grown by pulsed laser interval deposition
Autor: | Dave H. A. Blank, Gustaav van Tendeloo, Gertjan Koster, Horst Rogalla, Guus Rijnders, K. Verbist |
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Přispěvatelé: | Faculty of Science and Technology, Inorganic Materials Science |
Rok vydání: | 2001 |
Předmět: |
Reflection high-energy electron diffraction
Materials science IR-36068 Physics Superlattice Analytical chemistry Energy Engineering and Power Technology Island growth Condensed Matter Physics Epitaxy Electronic Optical and Magnetic Materials Pulsed laser deposition METIS-200538 Electron diffraction Transmission electron microscopy Electrical and Electronic Engineering Selected area diffraction |
Zdroj: | Physica C, 353, 167-183. Elsevier Physica: C: superconductivity |
ISSN: | 0921-4534 |
Popis: | We report on the preparation of CuBa(2)(Sr(x)Ca(1-x))(n)Cu(n-1)O(y) compounds by fabrication of (Ba,Sr,Ca)CuO(2) superlattices with pulsed laser deposition (PLD). A technique called interval deposition is used to suppress multi-level or island growth resulting in high-quality superlattice structures. Both, the applicability of PLD to atomic engineering as well as the fabrication of artificial superconductors is demonstrated. The (Sr,Ca)CuO(2)-BaCuO(2) superlattices are characterized by X-ray diffraction, high-resolution electron microscopy (HREM) and selected area electron diffraction. The superlattice period has been deduced from electron diffraction patterns and XRD measurements. For Sr containing films, the best growth behavior is observed and films with the highest degree of crystallinity are obtained, whereas superconductivity is only found in less crystalline, Ca containing films. Under some deposition conditions and depending on the amount of Ba containing layers in the superlattice, it was observed that the BaCuO(2) material is converted to Ba(2)CuO(4-delta). Image simulations to interpret the HREM contrast are performed. (C) 2001 Elsevier Science B.V. All rights reserved. |
Databáze: | OpenAIRE |
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