| YBa2Cu3O7超导管内磁场与外磁场的关系 |
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| 引用本文： | 徐凤枝,杨沛然,陈烈,陈肖兰,柴璋,李碧钦.YBa2Cu3O7超导管内磁场与外磁场的关系[J].物理学报,1989,38(6):1016-1020. |
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| 作者姓名： | 徐凤枝 杨沛然 陈烈 陈肖兰 柴璋 李碧钦 |
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| 作者单位： | (1)中国科学技术大学研究生院; (2)中国科学院物理研究所 |
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| 摘 要： | 本文报道了当外磁场He较低时(He<4Hrm,其中Hrm是超导管的最大捕获磁场),超导管的内磁场Hi与时间及外磁场的关系可表示为H0+B0(lnt+1-exp(-t/τ)),式中B0Int与磁通蠕动有关,Bc(1-exp(-t/τ))与外磁场引起的磁通扰动有关。扰动随时间很快衰减.H0,B0及1/τ随外磁场增加,在He>Hrm时,这几个量增加较大。当直流外磁场He<1/2Hrm时,超导管可将其完全屏蔽,对交流场不能完全屏蔽,但其屏蔽效果仍优于最好的金属屏蔽筒。
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| 关 键 词： | 超导合金 超导管 磁场 |
| 收稿时间： | 1988-10-04 |
THE RELATIONSHIP BETWEEN INTERNAL AND EXTERNAL MAGNETIC FIELD IN YBa2Cu3O7 TUBE |
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| XU FENG-ZHI,YANG PEI-RAN,CHEN LIB,CHEN XIAO-LAN,CHAI ZHANG and LI BI-QING.THE RELATIONSHIP BETWEEN INTERNAL AND EXTERNAL MAGNETIC FIELD IN YBa2Cu3O7 TUBE[J].Acta Physica Sinica,1989,38(6):1016-1020. |
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| Authors: | XU FENG-ZHI YANG PEI-RAN CHEN LIB CHEN XIAO-LAN CHAI ZHANG and LI BI-QING |
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| Abstract: | In this paper, we report the time dependence of the magnetic field inside a YBa2Cu3O7 tube, when switching on a field He outside the tube after a zero field cooling the tube into a superconducting state. In our experiment He is smaller than 4Hrm, where Hrm is the trapped field of the tube. The dependence can be expressed as Hi(t)=H0 + B0(Int + 1-exp(-t/τ)), where H0, B0 and 1/τ are functions of He, and they keep rising when He>Hrm. We suggest that the term of Int is caused by flux lines creeping, while (1-exp(-t/τ)) results from flux lines fluctuating, which is a short time effect. The shielding effect of YBa2Cu3O7 tubes is perfect for low dc field (rm/2), and better than the best normal metal for ac magnetic noise. |
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