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首页> 外文期刊>Journal of Experimental and Theoretical Physics >Transient photoimpedance response of YBa_2Cu_3O_(7-#delta#) epitaxial films in the mixed state
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Transient photoimpedance response of YBa_2Cu_3O_(7-#delta#) epitaxial films in the mixed state

机译：YBa_2Cu_3O_（7-＃delta＃）外延膜在混合态的瞬态光阻抗响应

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This paper reports on an investigation of transient photoimpedance response to radiation, in other words, real-time variations of the impedance induced by femtosecond optical pulses in superconducting films transferred to the mixed state by an external magnetic field applied parallel to the c-axis. When the films were in a state characterized by the absence of dc resistivity, the response amplitude increased with the magnetic field faster than expected owing to the contribution of magnetic vortices to the impedance of a superconductor with s-wave pairing of electrons. It turned out that the effect is due to a growth in the effective density of quasiparticle states in the mixed state of a d-wave superconductor. In the absence of magnetic field, however, the response amplitude was higher at lower temperatures, which contradicts the predictions of both models. Possible reasons for this feature in the response as a function of temperature are discussed.
机译：本文报道了对辐射的瞬态光阻抗响应的研究，换言之，飞秒光学脉冲在平行于c轴施加的外部磁场转移到混合态的超导薄膜中由飞秒光脉冲引起的阻抗的实时变化。当薄膜处于不存在直流电阻率的状态时，由于磁涡旋对电子的s波配对对超导体阻抗的影响，磁场的响应幅度比预期的要快。事实证明，该影响是由于在d波超导体的混合状态下准粒子状态的有效密度的增加。但是，在没有磁场的情况下，较低温度下的响应幅度较高，这与两个模型的预测均相矛盾。讨论了该特性随温度变化的可能原因。

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