Dynamical properties of bidirectional charge-density waves inErTe3

Abstract

We report a strong difference in the sliding properties of the bidirectional charge density wave (CDW) in the two-dimensional rare earth tritelluride ErTe3 which occurs below TCDW 1 = 265 K with a wave vector along c-axis and below TCDW 2 = 165 K with a wave vector along a-axis; the excess current carried by the motion of the CDW is 10 times less for the lower CDW compared with the value of the upper one. We tentatively explain this result by a stronger pinning of the lower temperature CDW intricated with the upper one, which inhibits its motion and may generate a phase slippage lattice.

Superconductivity Induced by Lifshitz Transition in Pristine SnS2 under High Pressure

“…The voltage changes linearly with the increase of current at different temperatures, which indicates SnS 2 is a pure metal state under 39.2 GPa. No saturation voltage or regular fluctuation related to charge density waves was found in the differential resistance, d V /d I . , …”

Distinction between pristine and disorder-perturbed charge density waves in ZrTe3

“…They are all expected to occur at the mesoscopic scale, i.e., comparable to the CDW domain sizes that are often much greater than the density-modulation periodicity. Unfortunately, the majority of experiments carried out to date for addressing disorder effects in CDW materials fall either into the macroscopic regime, such as transport and thermodynamic measurements [27][28][29] , or into the atomic-scale regime, such as scanning probe experiments 30,31 .…”

Possible origin of nonlinear conductivity and large dielectric constant in the commensurate charge-density-wave phase of 1T−TaS2

“…In the incommensurate CDW system, extremely large polarization effects are expected due to weak pinning from impurities or defects [51]. For the CCDW state in 1T-TaS 2 , unlike the incommensurate 2D-system TbTe 3 where Sinchenko et al observed CDW sliding [25], for it would be difficult to slide in a moderate electric field due to the strong pinning by the underlying lattice and hence the contribution to the static dielectric constant would be much smaller [51]. Here one may argue that the mechanism in establishing the colossal dielectric constant in (NbSe 4 ) 3 I (due to the slight shift of the single chains against each other) can be a potential substitute for 1T-TaS 2 , however, such similar features of the lattice structure has not been identified yet [10].…”

“…The 2D-CDW often reveals itself in layered transition-metal dichalcogenides and rareearth tritellurides [13,14,[23][24][25][26]. Researchers began to study the charge transport properties of 2D-CDW systems (1T-TaS 2 ) about forty years ago: Refs.…”