Charge density wave transition and nonlinear conductivity in NbS3

Zettl, A.; Jackson, Charles M.; Jànossy, A.; Grüner, G.; Jacobsen, Arnhild; Thompson, A. H.

doi:10.1016/0038-1098(82)90491-4

Cited by 45 publications

(24 citation statements)

References 10 publications

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“…As for a few other MX 3 compounds, e.g. NbSe 3 and the monoclinic polymorph of TaS 3 (m-TaS 3 ) 11,12 , pairs of IC satellites in the electron DPs of NbS 3 -II 6 correspond to two CDWs with satellites at position (0.5, 0.298, 0) and (0.5, 0.352, 0) 2,13,14 . The non-zero x-parameters (0.5) of these positions are in fact a result of the extinction rules, imposed by the modulation space group, while the actual modulation of both CDWs is directed along the columns with q 1 = (0, 0.298,0) and q 2 = (0, 0.352, 0).…”

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confidence: 78%

Basic and charge density wave modulated structures of NbS3 -II

Zupanič

Midden

et al. 2018

Phys. Rev. B

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The basic and the charge density wave (CDW) structures of the monoclinic NbS3-II polymorph were studied by synchrotron x-ray diffraction, ab-initio calculation, simulation of electron diffraction patterns and by atomicresolution transmission electron and low-temperature scanning tunneling microscopies. It is shown that the basic structure belongs to the space group P 21/m and is described with a unit cell, formed of four pairs of symmetry-related trigonal prismatic (TP) columns (a0 = 0.96509(8) nm, b0 = 0.33459(2) nm, c0 = 1.9850(1) nm, β0 = 110.695(4) • ), with all Nb and S atoms in 2e special positions. The two CDWs, with q1 = (0, 0.298,0) and q2 = (0, 0.352, 0), form their own modulation unit cells (am = 2a0, bm = b0/qjb, cm = c0, βm = β0) and are ordered pairwise along adjacent isosceles TP columns. The symmetries of both qj modes belong to the space group Cm and are related according to the 2a special positions. If considered as long-period commensurate, the entire modulated structure with both CDWs included is best described with an enlarged unit cell (a = 2a0, b = 37b0, c = c0, β = β0), with all Nb and S atoms in 1a positions of the space group P 1.

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confidence: 78%

Basic and charge density wave modulated structures of NbS3 -II

Zupanič

Midden

et al. 2018

Phys. Rev. B

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“…The quasi 1D CDWs also feature an enormous dielectric constant and metastable states originating from their deformability. In addition to these basic effects, a number of other features have been investigated including synchronization of CDW sliding with an external radio-frequency (RF) perimental results on NbS 3 -II were published in the 1980s [1,2,10,11,[13][14][15][16], little subsequent work was undertaken until 2009. This gap was largely due to difficulties with synthesizing the compound: NbS 3 -II whiskers were only found as rare inclusions accompanying the growth of the semiconducting phase of NbS 3 (hereafter NbS 3 -I) [11], which was more extensively studied [1,2,17,18].…”

Section: Introductionmentioning

confidence: 99%

NbS3: A unique quasi-one-dimensional conductor with three charge density wave transitions

et al. 2017

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Through transport, compositional and structural studies, we review the features of the chargedensity wave (CDW) conductor of NbS3 (phase II). We highlight three central results: 1) In addition to the previously reported CDW transitions at TP 1 = 360 K and TP 2 = 150 K, another CDW transition occurs at a much higher temperature TP 0 = 620-650 K; evidence for the non-linear conductivity of this CDW is presented. 2) We show that CDW associated with the TP 2 -transition arises from S vacancies acting as donors. Such a CDW transition has not been observed before. 3) We show exceptional coherence of the TP 1-CDW at room-temperature. Additionally, we report on the effects of uniaxial strain on the CDW transition temperatures and transport.

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“…Members of this group of compounds include in addition to NbSe 3 its isostructural monoclinic polymorph m-TaS 3 [1], NbS 3 [2], (TaSe 4 )I [3], (NbSe 4 ) 10 I 3 [4], the "blue bronzes" A 0.3 MoO 3 with A = K, Rb, Tl [5][6][7][8] and the organic conductor TTF-TCNQ [9]. This rather limited list of compounds characterized by the extraordinary transport properties triggered a large interest and a detailed consideration of the phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Charge density waves in NbSe3: The models and the experimental evidence

Prodan

Midden

Žitko

et al. 2010

Solid State Communications

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Abstract. Charge density wave (CDW) ordering in the prototypical low-dimensional compound NbSe 3 is reconsidered. We show that the widely accepted CDW model with two incommensurate modulations, q 1 = (0,0.241,0) and q 2 = (0.5,0.260,0.5), localized on type-III and type-I bi-capped trigonal prismatic (BCTP) columns, does not explain some details, revealed by various microscopic methods. The suggested alternative explanation is in a better accord with the entire experimental evidence, including low-temperature (LT) scanning tunneling microscopy (STM) results. It is based on the existence of modulated layered nano-domains formed below both CDW onset temperatures. According to this model, two of the three slightly different BCTP types of columns are modulated by the same wave vector, either q 1 or q 2 , which can easily switch over in a domain as a whole. This approach explains the presence of the q 2 modulation in the STM images recorded above the T 2 CDW transition and the absence of the q 2 satellites in the corresponding diffraction patterns. The long periodic modulation, detected by LT STM is attributed to a beating between the two CDWs, centered on adjacent columns of the same type. These pairs of columns, both either of type-III or type-I, modulated by the two alternative CDWs, represent the basic modulation units, ordered into nano-domains.

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Charge density wave transition and nonlinear conductivity in NbS3

Cited by 45 publications

References 10 publications

Basic and charge density wave modulated structures of NbS3 -II

Basic and charge density wave modulated structures of NbS3 -II

NbS3: A unique quasi-one-dimensional conductor with three charge density wave transitions

Charge density waves in NbSe3: The models and the experimental evidence

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