Elastic effects of an ac-driven charge-density wave inTaS3

Young’s modulus of o-${\mathrm{TaS}}_3$ was measured while its charge-density wave (CDW) was driven by a square-wave electrical bias at frequency ${\mathit{f}}_{\mathit{I}}$, with 100 Hz${\mathit{f}}_{\mathit{I}}$${\mathit{f}}_{\mathit{I}}$ reaches a few kHz, then increases toward the value for the stationary state at larger ${\mathit{f}}_{\mathit{I}}$. Such dramatic variations at relatively low frequency imply a relaxational origin of the effect. Evidence is presented for a broad distribution of characteristic times. Analogies between these findings and those for dielectric response, broadband noise, and overshoot current suggest that all low-frequency dynamic phenomena, elastic as well as electrical, may have a common relaxational origin.