三硫化钽的扭转类压电响应与电荷密度波脱钉效应
Characterization of the Torsional Piezoelectric-like Response of Tantalum Trisulfide Associated with Charge-Density-Wave Depinning
摘要：
我们研究了正交晶系TaS_3中电压诱导扭转应变的频率和电压依赖性[V. Ya. Pokrovskii等人，Phys.Rev.Lett. 98，206404（2007）]通过测量包含样品的RF腔的谐振频率的调制来测量。应变具有低于电荷密度波（CDW）阈值电压的起始电压，与剪切柔量和电阻的变化相关，这表明应变与CDW的极化而不是CDW电流相关。方波电压的测量结果表明，应变是非常缓慢的，甚至没有达到其直流值在0.1 Hz的频率，但动态似乎是非常样本依赖。通过施加振荡扭矩，同时偏置的样品与直流电流，我们也期待在样品中的应变感应电压;没有观察到在低偏置电压引起的应变第一次发生，但在较高的偏压下观察到的感应电压，可能与应变相关的CDW电导。
英文摘要：
We have studied the frequency and voltage dependence of voltage-induced torsional strains in orthorhombic TaS3 [V. Ya. Pokrovskii, et al, Phys. Rev. Lett. 98, 206404 (2007)] by measuring the modulation of the resonant frequency of an RF cavity containing the sample. The strain has an onset voltage below the charge-density-wave (CDW) threshold voltages associated with changes in shear compliance and resistance, suggesting that the strain is associated with polarization of the CDW rather than CDW current. Measurements with square-wave voltages show that the strain is very sluggish, not even reaching its dc value at a frequency of 0.1 Hz, but the dynamics appear to be very sample dependent. By applying oscillating torque while biasing the sample with a dc current, we have also looked for strain induced voltage in the sample; none is observed at the low biases where the voltage-induced strains first occur, but an induced voltage is observed at higher biases, probably associated with strain-dependent CDW conductance.
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