Charge-density-wave transport above room temperature in a polytype of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">NbS</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Wang, Z. Z.; Monçeau, P.; Salva, H.R.; Roucau, C.; Guémas, L.; Meerschaut, A.

doi:10.1103/physrevb.40.11589

Cited by 52 publications

(52 citation statements)

References 9 publications

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“…The electronic charge density wave (CDW) observed in variety of crystalline materials is accompanied by a periodic lattice distortion, which can be probed by scanning tunneling microscopy or by x-ray scattering techniques [8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

Evidence of the charge-density wave state in polypyrrole nanotubes

2015

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We present a detailed investigation of the low-frequency dielectric and conductivity properties of conducting polymer nanowires. Our results, obtained by connecting ∼ 10 7 nanowires in parallel, show that these polypyrrole nanowires behave like conventional charge density wave (CDW) materials, in their nonlinear and dynamic response, together with scaling of relaxation time and conductivity. The observed Arrhenius law for both these quantities gives a CDW-gap of 3.5 meV in the regime of temperature (∼ 40 K) in which the CDW state survives. We find good agreement with a theory of weakly pinned CDW, screened by thermally excited carriers across the CDW gap.The identification of polymer nanowires as CDW provides us a model system to investigate charge ordering owing to electrostatic interaction, relevant to a variety of systems from dusty plasma to molecular biology.

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Section: Introductionmentioning

confidence: 99%

Evidence of the charge-density wave state in polypyrrole nanotubes

2015

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“…29,30 In parallel, Roucau and co-workers proposed a closely related model monoclinic NbS 3 -ii unit cell with lattice parameters 2a , 2c , b /2, β based on a different multiple of the NbS 3 -i unit cell (Table I). 26,31,32 In the almost forty years since NbS 3 -ii was identified, however, its atomic structure has remained unsolved. During this time, continued interest in this polymorph has been motivated by its three CDWs: a low temperature transition at 150 K, a second transition at 330-370 K, and a high temperature transition at 620-650 K. 21,26 The transition at 330-370 K, just above room temperature, is an unusual one for CDW transport, and according to Zybtsev and co-workers, this CDW exhibits high transport velocities and sliding coherence.…”

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confidence: 99%

“…26,31,32 In the almost forty years since NbS 3 -ii was identified, however, its atomic structure has remained unsolved. During this time, continued interest in this polymorph has been motivated by its three CDWs: a low temperature transition at 150 K, a second transition at 330-370 K, and a high temperature transition at 620-650 K. 21,26 The transition at 330-370 K, just above room temperature, is an unusual one for CDW transport, and according to Zybtsev and co-workers, this CDW exhibits high transport velocities and sliding coherence. 21 A high-pressure modification of NbS 3 prepared at 700 • C with 2 GPa pressure was reported by Kikkawa and co-workers in 1982.…”

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confidence: 99%

Monoclinic structures of niobium trisulfide

et al. 2017

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Two new polymorphs of niobium trisulfide are established by single crystal x-ray diffraction. NbS3-iv crystallizes in the monoclinic space group P21/c with lattice parameters a = 6.7515(5) Å, b = 4.9736(4) Å, c = 18.1315(13) Å, and β = 90.116(2)°. Its structure is based on chains of [NbS6] trigonal prisms containing Nb–Nb pairs with a bond length of 3.0448(8) Å; this pairing causes the chains to corrugate slightly along their axis, a feature also present in triclinic NbS3-i that leads to semiconductor properties. The stacking arrangement of chains is different in these polymorphs, however, with NbS3-i having an ABCDE repeating sequence of chain bilayers and NbS3-iv having an AB repeating sequence. HRTEM studies show the presence of topotactically-oriented intergrown zones and numerous dislocations, which result in mosaic structuring. A second new polymorph, NbS3-v, crystallizes in the monoclinic space group P21/m with lattice parameters a = 4.950(5) Å, b = 3.358(4) Å, c = 9.079(10) Å, β = 97.35(2)°. In contrast to NbS3-iv, NbS3-v maintains fixed a Nb–Nb bond distance of 3.358(4) Å along the chains, and it has an ABCDE repeating sequence of chain bilayers similar to NbS3-i. High resolution scanning transmission electron microscopy (HR-STEM) imaging of an exfoliated NbS3-v nanoribbon shows the continuous [NbS6] chains oriented along the b-axis. These results provide the first firmly established structural data for monoclinic NbS3. In addition, SEM images show the formation of NbS3 rings and cylinders, and a combination of powder x-ray diffraction and Raman spectroscopy provides a way to distinguish between NbS3 polymorphs.

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“…The compound NbS 3 is known to exist in three crystal polytypes [8]. We studied NbS 3 (I), consisting of pairs of Nb atoms with different length along the chain (3.04 Å and 3.69 Å).…”

Section: Methodsmentioning

confidence: 99%

Assumed Peierls transition in NbS₃ under pressure

Dizhur

Il’ina

Zaitzev-Zotov

2009

Physica Status Solidi (b)

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The effect of pressure on the conduction of the NbS3 quasi‐one‐dimensional conductor is studied. A pressure induced insulator–metal transition is observed. The transition is accompanied by an increase in conductivity by six orders of magnitude at room temperature and the sign of thermal coefficient of resistance changes at pressure of about 5 GPa. An additional stepdown‐like feature appears in the temperature dependences of resistance that is interpreted as a Peierls transition. The transition temperature TP depends on pressure as TP [K] = 7.5P [GPa] + 202. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Charge-density-wave transport above room temperature in a polytype ofNbS3

Cited by 52 publications

References 9 publications

Evidence of the charge-density wave state in polypyrrole nanotubes

Evidence of the charge-density wave state in polypyrrole nanotubes

Monoclinic structures of niobium trisulfide

Assumed Peierls transition in NbS₃ under pressure

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Charge-density-wave transport above room temperature in a polytype ofNbS3

Cited by 52 publications

References 9 publications

Evidence of the charge-density wave state in polypyrrole nanotubes

Evidence of the charge-density wave state in polypyrrole nanotubes

Monoclinic structures of niobium trisulfide

Assumed Peierls transition in NbS3 under pressure

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Assumed Peierls transition in NbS₃ under pressure