MEASUREMENTS OF THE SURFACE-RESISTANCE OF HIGH-TC SUPERCONDUCTORS AT HIGH RF FIELDS

被引:23
作者
DELAYEN, JR
BOHN, CL
ROCHE, CT
机构
[1] Engineering Physics Division, Argonne National Laboratory, Argonne, 60439, Illinois, 9700, South Cass Avenue
来源
JOURNAL OF SUPERCONDUCTIVITY | 1990年 / 3卷 / 03期
关键词
accelerator; High-T[!sub]c[!/sub; microwave; superconductors;
D O I
10.1007/BF00625264
中图分类号
O59 [应用物理学];
学科分类号
摘要
We report measurements of the r.f. surface resistance of a wide variety of high-Tc superconductors in bulk form and as films on silver substrates. Several apparatuses have been constructed and used for measurements at frequencies from 0.15 to 40 GHz and r.f. surface magnetic fields as high as 640 G. In every case in which the field dependence of the surface resistance was measured, the surface resistance increased monotonically with field amplitude through a transition region characterized by a strong field dependence. It then saturated at high field at a value of a few percent of the normal-state surface resistance just above Tc. In the presence of this field dependence, the frequency dependence of the surface resistance changed from quadratic to less than linear. © 1990 Plenum Publishing Corporation.
引用
收藏
页码:243 / 250
页数:8
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