XAS STUDY OF (BaCuO2)2/(CaCuO2)n SUPERLATTICES
| Autor: | G. Petrocelli, Fabrizio Arciprete, Adalberto Balzarotti, Giuseppe Balestrino, S. Colonna, Pier Gianni Medaglia |
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| Rok vydání: | 2000 |
| Předmět: |
chaotic dynamics
conductor surface charge crystal structure roentgen spectroscopy geometry Materials science Superlattice Settore FIS/03 - Fisica della Materia chemical composition chemical bond conference paper copper complex Superconductivity X-ray absorption spectroscopy Condensed matter physics Extended X-ray absorption fine structure calcium oxide Statistical and Nonlinear Physics Condensed Matter Physics Block (periodic table) barium oxide oxygen fluorescence XANES Crystallography Octahedron Absorption (chemistry) |
| Zdroj: | International Journal of Modern Physics B. 14:2628-2633 |
| ISSN: | 1793-6578 0217-9792 |
| DOI: | 10.1142/s0217979200002521 |
| Popis: | EXAFS (Extended X-ray Absorption Fine Structure) and XANES (X-Ray Absorption Near Edge Structure) spectroscopies have been used to probe the local bonding of the artificially layered superconducting (BaCuO2)2/(CaCuO2)n (n = 2, 3, 4) superlattices. Fluorescence-yield measurements have been performed above the Cu and Ba K-edges. This study shows that the charge reservoir (CR) block of the Ba/Ca superlattice contains oxygen vacancies randomly distributed in the CuO2 planes and that the two apical oxygen atoms are displaced out of the Ba plane giving rise to buckled BaO planes. These oxygen atoms have a distorted pyramidal and octahedral coordination around Cu at Ba/Ca interface and in the (BaCuO2) block, respectively. |
| Databáze: | OpenAIRE |
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