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OBSERVATION OF RF SQUID CHARACTERISTICS IN YBCO BULK AT 77.K

被引：9
作者：
KHARE, N
GUPTA, AK
ARORA, SK
TOMAR, VS
OJHA, VN
机构：
[1] National Physical Laboratory, New Delhi, 110 012, Dr K S Krishnan Road
来源：
PRAMANA-JOURNAL OF PHYSICS | 1990年 / 35卷 / 04期
关键词：
74.70; granular superconductors; High T[!sub] c[!/sub] superconductors; rf SQUIDs;
D O I：
10.1007/BF02845751
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
RF SQUID behaviour due to grain boundary weak links in a bulk YBCO is observed at 77 K using modified commercial rf electronics. Porous samples with low I c are found to show this characteristic whereas dense samples with higher I c do not show SQUID behaviour. V-B modulation characteristic is found to be better when the rf pumping frequency is kept slightly higher than the resonance frequency of the tank circuit. Designing of coil for tank circuit with appropriate Q has been found to be very crucial for seeing the SQUID behaviour. Estimation of parameters such as coupling constant, mutual inductance, inductance and radius of the SQUID loop, have been made and their significance is discussed. Flux noise spectrum of the bulk rf SQUID in flux locked mode is also reported. © 1990 Indian Academy of Sciences.
引用
收藏
页码：L415 / L420
页数：6
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