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Y0.9Eu0.1Ba2Cu3O7-δ中的磁通蠕动研究

蔡盟 方明虎 张宣嘉 焦正宽 张其瑞 容锡燊 赵柏儒

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Y0.9Eu0.1Ba2Cu3O7-δ中的磁通蠕动研究

蔡盟, 方明虎, 张宣嘉, 焦正宽, 张其瑞, 容锡燊, 赵柏儒

STUDIES OF FLUX CREEP IN Y0.9Eu0.1Ba2Cu3O7-δ

CAI MENG, FANG MING-HU, ZHANG XUAN-JIA, JIAO ZHENG-KUAN, ZHANG QI-RUI, RONG XI-SHEN, ZHAO BAI-RU
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  • 在较宽的温度(4.2-80K)和磁场(0-8T)范围内测量了YBa2Cu3O7-δ和Y0.9Eu0.1Ba2·Cu3O7-δ样品的磁滞回线和磁弛豫,研究了其M(t),Jc(T)和Ueff(J)关系,并与现有的一些理论模型所预言的结果进行了比较。结果表明:(1)与YBa2Cu3O7-δ相比,Y0.9Eu0.1·Ba2Cu3O7-δ样品的有效钉扎势和无磁通蠕动时的临界电流密度有明显提高,表明Eu的部分替代引入了新的、具有更大的钉扎势的钉扎中心;(2)与其它模型相比,集体钉扎——蠕动理论对我们的实验结果作了更好的描述,因而本文为这一理论提供了新的实验证据。
    The magnetic hysteresis and relaxation behaviors in YBa2Cu3O7-δ and Y0.9Eu0.1Ba2Cu3O7-δ samples were measured in the wide ranges of temperature (4.2-80K) and field (0-8 T). The M(t), Jc(T) and Ueff(J) relationships in these samples were studied and several theoretical models were tested. The results show:(1)Both the effective pinning energy and critical current density in the absence of flux creep are obviously higher in Y0.9Eu0.1Ba2Cu3O7-δ than in YBa2Cu3O7-δ sample, which indicates the introductions of new pinning centers with larger pinning energy by the partial substitution of Eu for Y. (2) Compared with other models, the collective flux creep theory gives the best description on our experimental results and thus this work provides a new experimental evidence for this theory.
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  • 文章访问数:  6267
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出版历程
  • 收稿日期:  1993-11-10
  • 刊出日期:  1994-09-20

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