arXiv subjects

I. G. Gorlova

Publications and source records attributed to I. G. Gorlova.

2 recordsLinked to original sources

arXiv2007

Torsional Strain of TaS$_3$ Whiskers on the Charge-Density Waves Depinning

We find that electric current $I$ exceeding the threshold value results in torsion deformation of o-TaS$_3$ samples with one contact freely suspended. The rotation angle, $δϕ$, of the free end achieves several degrees and exhibits hysteresis as a function of $I$. The sign of $δϕ$ depends on the $I$ polarity; a polar axis along the conducting chains (the {\it c}-axis) is pointed out. We associate the effect with surface shear of the charge-density waves (CDW) coupled to the crystal shear. The current-induced torsional strain could be treated in terms of enormous piezoelectric coefficients ($>10^{-4}$ cm/V) corresponding to shear. In essence, TaS$_3$ appears to be a ready torsional actuator based on the unique intrinsic property of the CDW.

cond-mat.str-el↗

arXiv2001

Critical current in charge-density wave transport

We report transport measurements under very high current densities $j$, up to $\sim10^8$~A/cm$^2$, of quasi-one-dimensional charge-density wave (CDW) conductors NbSe$_3$ and TaS$_3$. Joule heating has been minimized by using a point-contact configuration or by measuring samples with extremely small cross-sections. Above $j_c \approx 10^7$~A/cm$^2$ we find evidence for suppression of the Peierls gap and development of the metallic state. The critical CDW velocity corresponding with $j_0$ is comparable with the sound velocity, and with $Δ/ \hbar k_F$ ($k_F$ is the Fermi wave vector), which corresponds to the depairing current. Possible scenarios of the Peierls state destruction are discussed.

cond-mat.str-el↗