论文标题
高磁场涡流运动固定参数的微波测量NB $ _3 $ SN
Microwave measurements of the high magnetic field vortex motion pinning parameters in Nb$_3$Sn
论文作者
论文摘要
在此工作中，分析了NB $ _3 $ SN中的高频涡流运动。我们使用了以15 GHz调整的介电载荷谐振器来评估NB $ _3 $ SN BULK样品的表面阻抗$ Z $（24.8 at。at。\％sn）。从字段引起的$ z $变化，高频涡流参数（固定常数$ k_p $，depinning频率$ν_p$和通量流电阻率$ρ_{ff} $）在较大的温度和场范围内获得；分析了它们的场和温度依赖性。与其他超导材料的比较表明，强磁场中的高频应用也可与NB $ _3 $ SN相比。在目前的工作中，我们报告了关于NB $ _3 $ SN在强磁场中的微波响应的第一个测量值。
The high frequency vortex motion in Nb$_3$Sn was analyzed in this work up to 12 T. We used a dielectric loaded resonator tuned at 15 GHz to evaluate the surface impedance $Z$ of a Nb$_3$Sn bulk sample (24.8 at.\%Sn). From the field induced variation of $Z$, the high frequency vortex parameters (the pinning constant $k_p$, the depinning frequency $ν_p$ and the flux flow resistivity $ρ_{ff}$) were obtained over a large temperature and field range; their field and temperature dependence were analyzed. Comparison with other superconducting materials shows that high frequency applications in strong magnetic fields are also feasible with Nb$_3$Sn. In the present work, we report the first measurements about the microwave response in Nb$_3$Sn in strong magnetic fields.
