| Autor: |
V. G. Prokhorov, Y. P. Lee, J.-H. Kang, J. S. Park |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
Journal of Magnetics. 16:15-18 |
| ISSN: |
1226-1750 |
| DOI: |
10.4283/jmag.2011.16.1.015 |
| Popis: |
We have studied the TiO₂ doping effects on the flux pinning behavior of an MgB₂ superconductor synthesized by the in-situ solid-state reaction. From the field-cooled and zero-field-cooled temperature dependences of magnetization, the reversible-irreversible transition of TiO₂-doped MgB₂ was determined in the H-T diagram (the temperature dependence of upper critical magnetic field and irreversibility line). For comparison, the similar measurements are also obtained from SiC-doped MgB₂. The critical current density was estimated from the width of hysteresis loops in the framework of Bean’s model at different temperatures. The obtained results manifest that nano-scale TiO₂ inclusions served as effective pinning centers and lead to the enhanced upper critical field and critical current density. It was concluded that the grain boundary pinning mechanism was realized in a TiO₂-doped MgB₂ superconductor. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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