论文标题
NB3SN共面谐振器中的非线性Meissner效应
Nonlinear Meissner effect in Nb3Sn coplanar resonators
论文作者
论文摘要
我们通过在不同温度下测量谐振频率作为平行磁场的函数来测量谐振频率，从而研究了NB $ _3 $ sn薄膜共面谐振器中的非线性Meissner效应（NLME）。我们在薄膜中使用的低RF功率探测比伦敦的穿透深度$λ$薄，以显着增加涡旋渗透的场开始，并在平衡条件下测量NLME。与常规二次增加$λ（b）$相反，S-Wave超导体预计$ b $，我们观察到，使用$ b $的渗透深度几乎线性增加。我们得出的结论是，$λ（b）$的这种行为是由于我们的polycrystalline nb $ _3 $ sn膜中的较弱的链接晶粒边界所致，这可以模仿干净的D-Wave超导体中预期的NLME。
We investigated the nonlinear Meissner effect (NLME) in Nb$_3$Sn thin film coplanar resonators by measuring the resonance frequency as a function of a parallel magnetic field at different temperatures. We used low rf power probing in films thinner than the London penetration depth $λ(B)$ to significantly increase the field onset of vortex penetration and measure the NLME under equilibrium conditions. Contrary to the conventional quadratic increase of $λ(B)$ with $B$ expected in s-wave superconductors, we observed a nearly linear increase of the penetration depth with $B$. We concluded that this behavior of $λ(B)$ is due to weak linked grain boundaries in our polycrystalline Nb$_3$Sn films, which can mimic the NLME expected in a clean d-wave superconductor.
