Grain boundaries contribution to the complex susceptibility of KCu-Doped YBCO high-temperature superconductors
| Autor: | A. Veneva, I. Nedkov |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Superconductivity
High-temperature superconductivity Materials science Condensed matter physics Doping chemistry.chemical_element Intergranular corrosion Condensed Matter Physics Microstructure Copper Atomic and Molecular Physics and Optics law.invention chemistry law Coupling (piping) General Materials Science Grain boundary |
| Zdroj: | Journal of Low Temperature Physics. 107:497-502 |
| ISSN: | 1573-7357 0022-2291 |
| Popis: | We present results concerning the effect of adding potassium and excess copper (1÷5 wt.%) to the initial powder Y(1-0.2x)Ba(2-0.2x)KxCu3Oy, (x=0÷0.95) on the a.c. complex susceptibility and the development of the microstructure within the YBCO high-temperature superconducting system. The a.c. complex susceptibility Xac=X′-jX″ of KCu-doped YBCO was measured as a function of the temperature the magnetic field amplitude and the KCu concentration. The behavior of the intergrain loss temperature Tm was analyzed through the relationship h-a(1-t)n. The results obtained showed that the presence of K3CuO2 on the grain boundaries changes drastically the intergranular coupling and, within certain concentration limits, improves the critical HTSC characteristics. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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