頁籤選單縮合
題 名 | Magnetic Levitation Under Field Cooling Conditions for YBa₂Cu₃Ox Superconductors |
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作 者 | Chan,W. C.; | 書刊名 | Chinese Journal of Physics |
卷 期 | 38:6 2000.12[民89.12] |
頁 次 | 頁1079-1083 |
分類號 | 338 |
關鍵詞 | |
語 文 | 英文(English) |
英文摘要 | We have measured the levitation forces acting on a small permanent magnet by epoxy-YBCO superconducting samples with different grain size under both field cooling and zero field cooling conditions. It is found that the differences in the magnetic levitation forces between zero field cooling and field cooling samples are larger for larger grain size samples. It is also found that there exists a critical magnetic field Bo such that the field cooling magnetic levitation forces become very small for all applied magnetic fields smaller than Bo. This critical field Bo is also larger for a larger grain size sample. A model, consistent with the critical state model, is proposed to explain this field cooling phenomenon and good agreements have been obtained. |
本系統中英文摘要資訊取自各篇刊載內容。