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研究了嵌入Fabry-Perot谐振腔的高温超导双晶约瑟夫森结阵列毫米波相干辐射的实验结果.相干辐射是通过约瑟夫森结阵列与基片(作为一个介质谐振器)和Fabry-Perot(FP)谐振器的共同作用实现的.由166个高温超导双晶约瑟夫森结串联阵列在77 K温度下产生的相干辐射,辐射峰的中心频率为75.84 GHz,功率大约为10 pW.
关键词:
高温超导薄膜
Fabry-Perot谐振腔
约瑟夫森结
毫米波辐射 相似文献
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我们研究了Tl-2212超导薄膜在带有YSZ/CeO2缓冲层和带有CeO2/YSZ/CeO2缓冲层的Ni金属RABiTS基带上的生长情况.基带上的缓冲层是采用PLD方法制备的,Tl-2212薄膜的制备采用了磁控溅射和后热处理两步方法.XRD实验结果表明,Tl-2212薄膜都具有很好的c轴垂直于膜面的织构,并具有双向外延生长特性.在CeO2/YSZ/CeO2/Ni基带上制作的Tl-2212薄膜的Tc达到102.8K,Jc(77K,0T)达到2.6MA/cm^2;在YSZ/CeO2/Ni基带上薄膜的Tc可达97.7K,Jc(77K,0T)也可以达到0.45MA/cm^2. 相似文献
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与YBCO薄膜相比,Tl2Ba2CaCu2Ox薄膜具有更高的Tc和更好的抗湿性能,所以Tl2Ba2CaCu2Ox薄膜器件不仅在液氮温度下具有更好的稳定性,而且在室温下具有更长的存放寿命.我们用磁控溅射的方法分别在24°和36.8°的STO双晶衬底上外延出Tl2Ba2CaCu2Ox薄膜并制备成晶界结DC-SQUID,比较了二者由于晶界夹角不同而产生的性能差异,并给出可工作在95K的DC-SQUID干涉曲线;对工作在77K的Tl2Ba2CaCu2Ox和YBCO薄膜双晶DC-SQUID,比较了二者在噪声特性及临界电流和结电阻随温度变化等特性,并对结果作了讨论. 相似文献
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A new model analysis of the third harmonic voltage in inductive measurement for critical current density of superconducting films 下载免费PDF全文
The critical current density J c is one of the most important parameters of high temperature superconducting films in superconducting applications,such as superconducting filter and superconducting Josephson devices.This paper presents a new model to describe inhomogeneous current distribution throughout the thickness of superconducting films applying magnetic field by solving the differential equation derived from Maxwell equation and the second London equation.Using this model,it accurately calculates the inductive third-harmonic voltage when the film applying magnetic field with the inductive measurement for J c.The theoretic curve is consistent with the experimental results about measuring superconducting film,especially when the third-harmonic voltage just exceeds zero.The J c value of superconducting films determined by the inductive method is also compared with results measured by four-probe transport method.The agreements between inductive method and transport method are very good. 相似文献