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假设颗粒超导体内某点临界电流密度是该处磁场强度平均值的某种函数,计算了其实测临界电流密度与样品尺寸的关系.发现对目前实验中所用的烧结样品,实验测得的 YBaCuo超导体的临界电流密度有显著的尺寸效应. 相似文献
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本文给出了在瞬变电磁法大地电磁测量中,在半空间均匀条件下高TcSQUID所探测到的二次场B(t)的解析表达式,将高TcSQUID与常规感应探头作了对比.结果展示了在长偏移距(LOTEM)方法和磁偶极源探测深埋层的大体积金属矿体时,高TcSQUID有明显的优越性. 相似文献
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Simulation of dielectric resonator for a high-T_c radio frequency superconducting quantum interference device
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Nowadays,the high-critical-temperature radio frequency superconducting quantum interference device (high-T c rf SQUID) is usually coupled to a dielectric resonator that is a standard 10 × 10 × 1 mm 3 SrTiO 3 (STO) substrate with a YBa 2 Cu 3 O 7-δ (YBCO) thin-film flux focuser deposited on it.Recently,we have simulated a dielectric resonator for the high-T c rf SQUID by using the ANSOFT High Frequency Structure Simulator (ANSOFT HFSS).We simulate the resonant frequency and the quality factor of our dielectric resonator when it is unloaded or matches a 50-impedance.The simulation results are quite close to the practical measurements.Our study shows that ANSOFT HFSS is quite suitable for simulating the dielectric resonator used for the high-T c rf SQUID.Therefore,we think the ANSOFT HFSS can be very helpful for investigating the characteristics of dielectric resonators for high-T c rf SQUIDs. 相似文献
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对吴杭生等人的计算公式做了适当的简化.可减小数值计算的工作量.不通过数值计算,直接估计了磁场能使偶数标号台阶高度增大的上限标号n、对2e/h测量中用加磁场来增大台阶高度是否有意义的问题做了讨论. 相似文献