Electron correlation and charge transfer in [(Ba0.9Nd0.1)CuO2+delta](2)/[CaCuO2](2) superconducting superlattices
| Autor: | Freelon, B, Augustsson, A, Guo, J-H, Medaglia, PG, Tebano, A, Balestrino, G |
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| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
RAY-FLUORESCENCE SPECTROSCOPY
TUNABLE-EXCITATION superlattices charge transfer electrons X ray spectroscopy Superconducting materials electron correlation OXYGEN charge transport Settore FIS/03 - Fisica della Materia Condensed Matter::Materials Science temperature distribution Barium compounds Heteroepitaxial structures Condensed Matter::Superconductivity X-RAY EMISSION |
| Zdroj: | Physical review letters 96 (2006). info:cnr-pdr/source/autori:Freelon, B; Augustsson, A; Guo, J-H; Medaglia, PG; Tebano, A; Balestrino, G/titolo:Electron correlation and charge transfer in [(Ba0.9Nd0.1)CuO2+delta](2)%2F[CaCuO2](2) superconducting superlattices/doi:/rivista:Physical review letters (Print)/anno:2006/pagina_da:/pagina_a:/intervallo_pagine:/volume:96 |
| Popis: | We use x-ray spectroscopy to examine the electronic structure of high-temperature superconducting superlattices [(Ba0.9Nd0.10)CuO2+delta](2)/[CaCuO2](2). The O 2p density of states reveals the insulating character of the individual component layers and the metallic character of the superlattices. We report the first direct observation of Zhang-Rice singlets in artificial high-temperature superconducting heteroepitaxial structures. The experimental findings in the superlattices and its component layers offer evidence of charge transport from the so-called charge reservoir layer to the superconducting infinite layer. This suggests a strong link between superconductivity and both electron correlation and charge transfer within the superlattices. |
| Databáze: | OpenAIRE |
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