论文标题
通过表面阻抗的多频测量来固定fesete薄膜的特性
Pinning properties of FeSeTe thin film through multifrequency measurements of the surface impedance
论文作者
论文摘要
我们提出了FESE $ _x $ _X $ _ {1-x} $（$ x = 0.5 $）的涡旋动力学的高频测量，该薄膜在CAF $ _2 $ substrate上生长，并具有临界温度$ T_C \ simeq18 \; $ K，$ k，$ k，通过双频率dielectric dielectric Resonator and ghz和16.4 ghz和16.4 ghz和16.4 ghz。我们提取和讨论与样品的固定属性相关的各种重要涡旋参数，例如特征频率$ν_c$，固定常数$ k_p $和与蠕变现象相关的固定屏障高度$ u $。我们发现涡流系统处于单涡流状态，并且固定在$ k_p $方面的固定值相对较高，这表明这里研究了高频。固定障碍能$ U $很小，并且表现出非单调温度依赖性，最大值接近12 k。根据核心固定质量钉的核心固定，大小$ \ proptate^3 $跳出了很小的距离，在很小的距离上跳出孔，这一过程在很小的频率中，在频率高，短距离范围内vortex oscillations ocscillations ocscillations occillations occillations occillations offerations。
We present high frequency measurements of the vortex dynamics of a FeSe$_x$Te$_{1-x}$ ($x=0.5$) thin film grown on a CaF$_2$ substrate and with a critical temperature $T_c\simeq18\;$K, performed by means of a dual frequency dielectric resonator at 16.4 GHz and 26.6 GHz. We extract and discuss various important vortex parameters related to the pinning properties of the sample, such as the characteristic frequency $ν_c$, the pinning constant $k_p$ and the pinning barrier height $U$ relevant for creep phenomena. We find that the vortex system is in the single-vortex regime, and that pinning attains relatively high values in terms of $k_p$, indicating significant pinning at the high frequencies here studied. The pinning barrier energy $U$ is quite small and exhibits a non-monotonous temperature dependence with a maximum near 12 K. This result is discussed in terms of core pinning of small portion of vortices of size $\proptoξ^3$ jumping out of the pinning wells over very small distances, a process which is favoured in the high frequency, short ranged vortex oscillations here explored.
