| YBa2Cu3Oy中氧缺位的磁通钉扎效应 |
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| 引用本文： | 胡刚进,方明虎,李钟贤,曾兴斌,陈南松,焦正宽,张其瑞,张贻瞳,金新,姚希贤.YBa2Cu3Oy中氧缺位的磁通钉扎效应[J].物理学报,1993,42(10):1669-1673. |
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| 作者姓名： | 胡刚进 方明虎 李钟贤 曾兴斌 陈南松 焦正宽 张其瑞 张贻瞳 金新 姚希贤 |
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| 作者单位： | (1)金日成大学物理系,平壤,朝鲜民主主义人民共和国; (2)南京大学物理系,南京210008; (3)浙江大学物理系,杭州310027 |
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| 摘 要： | 制备了一组不同氧含量(Tcmid>90K)的YBa2Cu3Oy单相多晶样品。对其结构、超导电性和磁通钉扎行为的观测结果表明:氧缺位导致临界电流密度Jc和钉扎力密度Fp同时增加,存在一最佳的氧缺位浓度,可使Jc和Fp有最大程度提高。与氧含量y=6.96和6.83时的情况不同,对y=6.94和6.86的样品,其Jc
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| 收稿时间： | 1992-12-29 |
FLUX PINNING EFFECT OF OXYGEN DEFICIENCIES IN YBa2Cu3Oy |
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| HU GANG-JIN,FANG MING-HU,LI ZHONG-XIAN,ZENG XING-BIN,CHEN NAN-SONG,JIAO ZHEN-KUAN,ZHANG QI-RUI,ZHANG YI-TONG,JIN XIN and YAO XI-XIAN.FLUX PINNING EFFECT OF OXYGEN DEFICIENCIES IN YBa2Cu3Oy[J].Acta Physica Sinica,1993,42(10):1669-1673. |
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| Authors: | HU GANG-JIN FANG MING-HU LI ZHONG-XIAN ZENG XING-BIN CHEN NAN-SONG JIAO ZHEN-KUAN ZHANG QI-RUI ZHANG YI-TONG JIN XIN and YAO XI-XIAN |
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| Abstract: | A series of single phase YBa2Cu3Oy samples with various oxygen contents and Tcmid's> 90K were prepared, and their structures, superconductivities, flux pinning behaviors have been determined and investigated. The experimental results show that the oxygen deficiencies result in enhancements of critical current density Jc and flux pinning force density Fp, moreover, there exists an optimal concentration of okygen deficiencies, corresponding to the maximal enhancemenes of Jc and Fp. Different from the cases of y= 6. 96,6. 83,Jc of y= 6.94,6.86 samples vary unmonotonicly with magnetic field H, correpondingly, the magnetization curves exhibit an abnormal peak known as "fishtail" effect. Fitted with the scaling law, it is found that when 6.83≤y≤6.94, the peak in fp(h) curves appears at the same reduced magnetic field h(≈0. 6). It indicates that the existence of oxygen deficiencies introduces new flux pinning centres in YBa2Cu3Oy. |
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