The hole concentration on oxygen sites in teh high Tc superconductor YBa2Cu3O7-x
| Autor: | C. Kunz, P. Steiner, S. Kemmler-Sack, R. Schulz, I. Sander, V. Kinsinger, G. Schwitzgebel, H. Schmitt, B. Siegwart, S. Junk, Stefan Hüfner, R. Hoppe, C. Politis, H. P. Müller, A. Gold |
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| Rok vydání: | 1988 |
| Předmět: |
Superconductivity
Materials science High-temperature superconductivity Condensed matter physics Transition temperature chemistry.chemical_element Surfaces and Interfaces General Chemistry Crystal structure Condensed Matter Physics Oxygen Copper Surfaces Coatings and Films law.invention X-ray photoelectron spectroscopy chemistry law Condensed Matter::Superconductivity Materials Chemistry Spectroscopy |
| Zdroj: | Surface and Interface Analysis. 12:326-326 |
| ISSN: | 1096-9918 0142-2421 |
| DOI: | 10.1002/sia.740120514 |
| Popis: | From XPS core level spectroscopy the average copper charge on the Cu sites in the high temperature superconductor Y1Ba2Cu3O7−x is determined as function of the oxygen vacancy concentrationx. Analysis of these data leads to the suggestion that there are holes on the oxygen sites in the basal plane of the crystal structure. The probability for holes on these oxygen ions is rather constant for 0≦x≦0.3 with a value of 0.64 and decreases to zero forx=0.5. The dependence of the superconducting transition temperature on the hole concentration is discussed. An energy level diagram for Cu2+ and Cu3+ in YBa2Cu3O7−x is constructed. |
| Databáze: | OpenAIRE |
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