通过超声激发原位操控超导性质
In-Situ Manipulation of Superconducting Properties via Ultrasonic Excitation
AI总结：
研究利用超声激发原位调控常规与非常规超导体的临界温度和上临界场，证实其非线性耦合机制，并通过对照实验区分自旋—轨道效应与局部加热。
摘要：
我们展示了通过超声激发对常规和非常规超导体的临界温度（$T_S$）与上临界场（$H_{C2}$）进行原位操控。利用交流磁化率测量，我们观察到随着所施加超声波振幅增加，$T_S$降低。这种降低对激发电压呈幂律依赖，表明超声波与超导序参量之间存在非线性耦合。在铜氧化物超导体中也观察到类似行为，这暗示被改变的超导性质与超声激发对反铁磁网络的调制之间可能存在联系。对轨道角动量淬灭（L=0）的顺磁材料Gd$_2$O$_3$进行测量后发现，即使在极端超声激发振幅下，磁化强度也没有变化。这突出了自旋—轨道耦合在所观察效应中的作用，并排除了局部温度升高影响测量的可能性。为进一步证实这一点，我们开展了辅助实验：让Cernox温度传感器承受超声激发，并记录其相对于参考Cernox的温差；同时测量功率差，以评估超声加热的影响。该分析表明，当超声振幅高于10 V$_{pp}$时，局部加热效应占据主导。
英文摘要：
We demonstrate in-situ manipulation of the critical temperature ($T_S$) and upper critical field ($H_{C2}$) of conventional and unconventional superconductors via ultrasonic excitation. Using an AC susceptibility measurements, we observed a reduction in $T_S$ with increasing amplitude of the applied ultrasonic waves. This reduction exhibits a power law dependence on the excitation voltage, suggesting a non-linear coupling between the ultrasonic waves and the superconducting order parameter. Analogous behavior was observed in cuprate superconductors, hinting at a possible link between the modified superconducting properties and the modulation of the antiferromagnetic network by ultrasonic excitation. Measurements on a paramagnetic material (Gd$_2$O$_3$) with quenched orbital angular momentum (L\,=\,0) revealed no change in magnetization even at extreme ultrasonic excitation amplitudes. This highlights the role of spin-orbit coupling in the observed effects and rules out the possibility of local temperature increases affecting the measurements. To further confirm this, we conducted auxiliary experiments where a Cernox temperature sensor was subjected to ultrasonic excitation, and the resulting temperature difference relative to a reference Cernox was recorded. Simultaneously, the power difference was measured to assess the impact of ultrasonic heating. This analysis revealed that localized heating effects become dominant above an ultrasonic amplitude of 10 V$_{pp}$.
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