MgO doping effects on flux pinning properties in Bi1.7Pb0.4Sr1.9Ca1Cu2O8+x crystals
| Autor: | H. Sasakura, A. Hirashima, D. Ito, Osuke Miura |
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| Rok vydání: | 2001 |
| Předmět: |
Flux pinning
Materials science Condensed matter physics Doping Analytical chemistry Energy Engineering and Power Technology Atmospheric temperature range Condensed Matter Physics Electronic Optical and Magnetic Materials Ion Crystal Meissner effect Irradiation Critical current Electrical and Electronic Engineering |
| Zdroj: | Physica C: Superconductivity. 354:247-251 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/s0921-4534(01)00072-7 |
| Popis: | Flux pinning properties for Bi 1.7 Pb 0.4 Sr 1.9 Ca 1 Cu 2 O 8+ x crystals with and without MgO powder were studied. MgO particles having 100 nm average diameter coarsened to an average diameter of 1 μm in the Bi 1.7 Pb 0.4 Sr 1.9 Ca 1 Cu 2 O 8+ x crystals. Critical current densities for the MgO doped crystals increased in temperature region from 20 to 77 K. MgO 5 wt.% crystals have higher J c than that of MgO 1 wt.% crystals in temperature range from 20 to 70 K. Scaling behaviors for the MgO 5 wt.% crystals suggest that the MgO particles are the dominant pinning centers for the crystal in temperature range from 40 to 77 K. Irreversibility field for the MgO 5 wt.% crystals increases to almost the same value of the crystals with the Ag ion irradiated crystal. |
| Databáze: | OpenAIRE |
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