Scanning tunneling microscopy of the charge-density wave in orthorhombic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">TaS</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Gammie, G.; Hubacek, J. S.; Skala, S. L.; Brockenbrough, R.; Tucker, J. R.; Lyding, Joseph W.

doi:10.1103/physrevb.40.11965

Cited by 13 publications

(10 citation statements)

References 14 publications

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“…they are not localized on any particular chains) [26]. It is very probable that the origin of the preferred position of the REHAC elementary excitation are the CDW dynamical defects, as sudden sliding of CDW for one lattice spacing in the chain direction has been observed even at room T [26]. In this very delicate entanglement of the lattice and CDW(s), it might be that the lattice tries to stagger the chains in order to reduce the Coulomb repulsion.…”

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confidence: 99%

Fractional power law susceptibility and specific heat in low-temperature insulating state of o-TaS ₃

et al. 2003

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PACS. 71.45.Lr -Charge density wave systems. PACS. 75.50.Lk -Spin glasses and other random magnets.Abstract. -Measurements of the magnetic susceptibility and its anisotropy in the quasi-onedimensional system o-TaS3 in its low-T charge density wave (CDW) ground state are reported. Both sets of data reveal below 40 K an extra paramagnetic contribution obeying a power-law temperature dependence χ(T)=AT −0.7 . The fact that the extra term measured previously in specific heat in zero field, ascribed to low-energy CDW excitations, also follows a power law CLEE(0,T)=CT 0.3 , strongly revives the case of random exchange spin chains. Introduced impurities (0.5% Nb) only increase the amplitude C, but do not change essentially the exponent. Within the two-level system (TLS) model, we estimate from the amplitudes A and C that there is one TLS with a spin s=1/2 localized on the chain at the lattice site per cca 900 Ta atoms. We discuss the possibility that it is the charge frozen within a soliton-network below the glass transition Tg ∼40 K determined recently in this system. c EDP Sciences

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confidence: 99%

Fractional power law susceptibility and specific heat in low-temperature insulating state of o-TaS ₃

et al. 2003

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“…The CDW of TaS 3 has been analyzed using various methods at a temperature below T p , including X-ray diffraction, electron diffraction, and scanning tunneling microscopy. The low-temperature characterization of CDW reports the existence of incommensurate and commensurate CDW depending on the temperature range [ 22 , 23 , 24 , 25 ]. Between T p and 100K, an incommensurate CDW with the wave vector of

is observed.…”

Section: Resultsmentioning

confidence: 99%

“…However, when the temperature surpasses the transition temperature, the periodicity of CDW becomes weak. For instance, from an STM study conducted at room temperature, a weak sign of CDW was observed [ 25 ]. Furthermore, above T p , the possibility of forming a pseudogap was proposed.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Electron Heat Conduction in TaS3 1D Metal Wire

Bahng

Park

et al. 2021

Materials

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The 1D wire TaS3 exhibits metallic behavior at room temperature but changes into a semiconductor below the Peierls transition temperature (Tp), near 210 K. Using the 3ω method, we measured the thermal conductivity κ of TaS3 as a function of temperature. Electrons dominate the heat conduction of a metal. The Wiedemann–Franz law states that the thermal conductivity κ of a metal is proportional to the electrical conductivity σ with a proportional coefficient of L0, known as the Lorenz number—that is, κ=σLoT. Our characterization of the thermal conductivity of metallic TaS3 reveals that, at a given temperature T, the thermal conductivity κ is much higher than the value estimated in the Wiedemann–Franz (W-F) law. The thermal conductivity of metallic TaS3 was approximately 12 times larger than predicted by W-F law, implying L=12L0. This result implies the possibility of an existing heat conduction path that the Sommerfeld theory cannot account for.

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“…The surfaces of many CDW systems have been studied especially by STM. The CDW phase is present at the top layer and can display a perfect long range order over hundreds of nanometers, like in the quasi-1D Rb 0.3 MoO 3 [34], K 0.9 Mo 6 O 17 [35], TaS 3 [36], NbSe 3 [37,38,39] and in the quasi-2D TbTe 3 [40,41] and 1T-TaS 2 [42]. Moreover, several groups observed a surface CDW using grazing incident X-ray diffraction in NbSe 2 [43] and K 0.3 MoO 3 [44].…”

Section: Discussionmentioning

confidence: 99%

“…As proposed by Yetman and Gill [18] and in [47], this effect could be associated to a commensurate CDW pinned to the crystal lattice at the surface in contrast to an incommensurate CDW in the bulk. Gammie et al measured the surface CDW modulation in TaS 3 to be approximately at the commensurate value 4c 0 × 10b 0 [48] where c 0 and b 0 are the crystal lattice parameters. Brun et al measured by STM the CDW wavevector in Rb 0.3 MoO 3 at the commensurate value q cdw = ±0.25b * + (a + 2c) * [49].…”

Section: Discussionmentioning

confidence: 99%

The essential role of surface pinning in the dynamics of charge density waves submitted to external dc fields

et al. 2020

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A Charge Density Wave (CDW) submitted to an electric field displays a strong shear deformation because of pinning at the lateral surfaces of the sample. This CDW transverse pinning was recently observed but has received little attention from a theoretical point of view until now despite important consequences on electrical conductivity properties. Here, we provide a description of this phenomenon by considering a CDW submitted to an external dc electric field and constrained by boundary conditions including both longitudinal pinning due to electrical contacts and transverse surface pinning. A simple formula for the CDW phase is obtained in 3D by using the Green function and image charges method. In addition, an analytical expression of the threshold field dependence on both length and sample cross section is obtained by considering the phase slip process. We show that the experimental data are well reproduced with this model and that bulk pinning can be neglected. This study shows that the dynamical properties of CDW systems could be mainly driven by boundary effects, despite the comparatively huge sample volumes.

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Scanning tunneling microscopy of the charge-density wave in orthorhombicTaS3

Cited by 13 publications

References 14 publications

Fractional power law susceptibility and specific heat in low-temperature insulating state of o-TaS ₃

Fractional power law susceptibility and specific heat in low-temperature insulating state of o-TaS ₃

Enhanced Electron Heat Conduction in TaS3 1D Metal Wire

The essential role of surface pinning in the dynamics of charge density waves submitted to external dc fields

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Scanning tunneling microscopy of the charge-density wave in orthorhombicTaS3

Cited by 13 publications

References 14 publications

Fractional power law susceptibility and specific heat in low-temperature insulating state of o-TaS 3

Fractional power law susceptibility and specific heat in low-temperature insulating state of o-TaS 3

Enhanced Electron Heat Conduction in TaS3 1D Metal Wire

The essential role of surface pinning in the dynamics of charge density waves submitted to external dc fields

Contact Info

Product

Resources

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Fractional power law susceptibility and specific heat in low-temperature insulating state of o-TaS ₃

Fractional power law susceptibility and specific heat in low-temperature insulating state of o-TaS ₃