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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Sharp increase of microwave absorption due to shaking of Josephson vortices in BiSCCO superconductor
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Sharp increase of microwave absorption due to shaking of Josephson vortices in BiSCCO superconductor

机译：BiSCCO超导体中约瑟夫森涡旋的摇动导致微波吸收的急剧增加

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摘要

We study microwave (9.36 GHz) dissipation in the layered, highly anisotropic superconductors Bi2212 and Bi2223 subjected to a constant magnetic field parallel to the layers. The signal has a characteristic magnetic field dependence, increasing linearly at small fields, reaching a maximum, and decreasing at large fields. We demonstrate experimentally that the microwave absorption is strongly enhanced by application of a low frequency ac magnetic field parallel to the static field. The results are interpreted in the framework of Joseph-son phase electrodynamics in layered superconductors. In particular, the enhancement is explained as a result of the depinning of the Josephson vortices by the ac field shaking. The theoretical dc field dependence of the microwave absorption for H_(dc)H_(ac) is in good agreement with experiment. The magnitude of the microwave signal increases rapidly with the anisotropy of the superconductor.
机译：我们研究了层状，高度各向异性超导体Bi2212和Bi2223在平行于各层的恒定磁场作用下的微波（9.36 GHz）耗散。信号具有特定的磁场依赖性，在小磁场下线性增加，达到最大值，在大磁场下减小。我们通过实验证明，通过应用平行于静态磁场的低频交流磁场，微波吸收会大大增强。在层状超导体中约瑟夫逊相电动力学的框架中解释了结果。尤其是，由于交流场振动使约瑟夫森涡旋脱销而解释了这种增强。 H_（dc） H_（ac）对微波吸收的理论直流场依赖性与实验吻合良好。微波信号的幅度随着超导体的各向异性而迅速增加。

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