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Microwave Response of Bi2Sr2CaCu2O8+δ Surface Intrinsic Josephson Junctions with Bending Pancake Vortices |
| WEI Yan-Feng;ZHAO Shi-Ping;ZHU Xiao-Bo;CHEN Geng-Hua;REN Yu-Feng;YU Hong-Wei;YANG Qian-Sheng |
| Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080 |
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| Cite this article: |
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WEI Yan-Feng, ZHAO Shi-Ping, ZHU Xiao-Bo et al 2007 Chin. Phys. Lett. 24 1709-1712 |
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Abstract We study the microwave response of surface intrinsic Josephson junctions on Bi2Sr2CaCu2O8+δ, in which bending pancake vortex lines are introduced in a controllable way. It is found that the bending vortices can greatly influence the response. In some cases, typical Shapiro steps that lie far above the quasiparticle branch are observed, with the step interval satisfying the Josephson relation and their amplitude versus the square root of microwave power following the Bessel function behaviour. In the other cases, current steps that lie on the quasiparticle branch are observed, but only one or two steps appear at the same time under the variation of the microwave power.
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| Keywords:
74.50.+r
74.72.Hs
85.25.Cp
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Received: 06 March 2007
Published: 17 May 2007
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