Transport properties of 1T-TaS2-xSex

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

“…4) is consistent with Ref. [28], indicating the occurrence of carriers localization in the single band approximation. However, we note that the dielectric spectrum can not be fitted well by the hopping process alone [36,37,52]: Fig.…”

“…In Ref. [28] Hambourger and Di Salvo suggested that the disorder induced localization may explain the transport properties in 1T-TaS 2−x Se x system, as supported by Dardel et al [29] and Kim et al [30]. Indeed, our data of the temperature dependent Hall coefficient (Fig.…”

“…However, σ dc at T =20 K is about 2.5 (Ω•cm) −1 and the density of carriers is order of 10 19 /cm 3[16], thus the mobility is estimated to be only several cm 2 /(V•s). Further, the experimental results from Ref [28]. also support a mobility less than 20 cm 2 /(V•s).…”

“…Ref. [28] shows ρ ⊥ /ρ ∼ 500 over the range 1.3<T<240 K, where ρ and ρ ⊥ are the resistivity perpendicular and parallel to the layers of 1T-TaS 2 crystal respectively, indicating an essential 2D system. In the experiments, we focused on the inplane polarization and transport properties of the sample with surface area 3.0 × 0.4 mm 2 and thickness (along c-axis) about 25 µm, and the distance between two potential contacts is about 1.0 mm.…”

“…Researchers began to study the charge transport properties of 2D-CDW systems (1T-TaS 2 ) about forty years ago: Refs. [14,27,28] suggested that the carriers localization induced by disorder may be responsible for the unique low temperature transport properties; whereas Uchida et al proposed that the non-linear conduction in the presence of a moderate electric field at low temperatures might be explained by the collective excitations in pinned CDW -the creation of a soliton in pair with an antisoliton [16]. In the followed experiments, though the electronic nature was probed by various powerful spectroscopies [29][30][31][32][33], until recent years the mechanisms for the charge dynamics of the commensurate CDW (CCDW) phase in 1T-TaS 2 has not been disclosed yet.…”