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YBa2Cu3O7-δ外延薄膜的不可逆线与磁通玻璃线

王智河 曹效文 方 军 陈治友 李可斌

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YBa2Cu3O7-δ外延薄膜的不可逆线与磁通玻璃线

王智河, 曹效文, 方 军, 陈治友, 李可斌

RELATION BETWEEN IRREVERSIBILITY LINE AND VORTEX-GLASS LINE IN EPITAXIAL YBa2Cu3O7-δ THIN FILMS

WANG ZHI-HE, CAO XIAO-WEN, FANG JUN, CHEN ZHI-YOU, LI KE-BIN
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  • 在0—10T磁场范围内,系统地测量了YBa2Cu3O7-δ外延薄膜处于磁场平行和垂直膜面两种情况下的R-T曲线和I-V曲线, 并对该样品的不可逆线和磁通玻璃线作了直接的比较.结果表明, 由不同约化电阻率判据给出的不可逆线和磁通玻璃线遵守相同的H∝(T(0)-T(H))n 关系.对于不可逆线, n=3/2,对于磁通玻璃线,n=4/3.不可逆线的位置不仅与判据有关而且与测量电流密度也有关,磁通玻璃线位于不可逆线的下方.探讨
    We have measured in detail the resistive transition and the isothermal current-voltage curves in the case of applied magnetic field parallel and perpendicular to the surface of the film up to 10T for an epitaxial YBa2Cu3O7-δ thin film, respectively. The comparative study of the irreversibility line from the R-T curves with the vortex-glass line from the I-V curves was made. The results showed that the irreversibility line determined from the different reduced resistivity criterion and vortex-glass line follow the same power law, H∝(T(0)-T(H))n, and n=4/3 for the vortex-glass line, n=3/2 for the irreversibility line. The irreversibility line is dependent not only on the different reduced resistivity criterion but also on the measuring current density. The vortex-glass line lies below the irreversibility line. The possible origin of the difference between such two lines was discussed.
    • 基金项目: 国家超导技术联合研究开发中心(批准号:95-预-06-9703)部分资助的课题.
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  • 文章访问数:  6010
  • PDF下载量:  661
  • 被引次数: 0
出版历程
  • 收稿日期:  1998-05-11
  • 修回日期:  1998-06-15
  • 刊出日期:  1999-01-20

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