Influence of oxygen deficiency on the superconducting properties of YBa2Cu3O7−δ
| Autor: | Christoph Meingast, Walter H. Fietz, O. Kraut, H. Claus, R. Ahrens, B. Frank, G. Bräuchle, A. Erb, German Müller-Vogt, H. Wühl, T. Wolf, R. Benischke, M. Braun |
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| Rok vydání: | 1991 |
| Předmět: |
Superconductivity
Range (particle radiation) Materials science Hydrostatic pressure Energy Engineering and Power Technology Thermodynamics Condensed Matter Physics Plateau (mathematics) Thermal expansion Electronic Optical and Magnetic Materials visual_art visual_art.visual_art_medium Jump Limiting oxygen concentration Ceramic Electrical and Electronic Engineering |
| Zdroj: | Physica C: Superconductivity. :755-756 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/0921-4534(91)91601-y |
| Popis: | Specific heat, thermal expansion, and pressure dependence of Tc have been investigated on polycrystals and single crystals (twinned and untwinned) of YBa2Cu3O7−δ with different oxygen content. For ceramic samples in the concentration range of the 90 K plateau, a strong decrease of the specific heat jump ΔCp at the superconducting transition is observed with decreasing oxygen concentration, whereas the expansivity jump Δa clearly increases. This behavior is thermodynamically consistent with the experimentally determined pressure dependence of Tc. Measurements on single crystals reveal that the Δa's for the three crystallographic axes are different in magnitude and sign, and strongly dependent on oxygen content. Thus, the hydrostatic pressure dependence of Tc is the result of a delicate balance of the uniaxial pressure dependences. |
| Databáze: | OpenAIRE |
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