Zaitsev-Zotov replies

Zaĭtsev-Zotov, S. V.

doi:10.1103/physrevlett.72.587

Cited by 29 publications

(47 citation statements)

References 3 publications

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“…This may indicate a breakdown of long-range CDW order in this phase regime; indeed, calculations of 1D CDW systems show that a softening of the CDW to shear deformations, and a consequent breakdown of long-range translational order, occurs when the coupling between CDW stripes reaches a critical value. [15] In sum, the observed pressure-dependencies of the CDW and lattice modes are characteristic of a regime in which the CDW has not only begun to soften, or 'melt', but in which the CDW may have an increased propensity to move ('slide') in response to an applied field due to decreased pinning to the lattice. (iii) Disordered regime -Finally, above P * ∼ 25 kbar, there is no evidence in the spectra for long-or short-range CDW order, suggesting that the CDW state has melted completely into a disordered phase.…”

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confidence: 91%

“…In theoretical support of this, ZaitsevZotov et al have shown that increased coupling between CDW stripes leads to an increase in dynamic fluctuations and a decreased CDW stiffness. [15] Interestingly, such long wavelength lattice fluctuations are expected to destroy long-range translational order but preserve longrange orientational order. [19] Second, the degree of interlayer coupling in 1T-TiSe 2 should influence the nature of the quantum melting transition.…”

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confidence: 99%

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Quantum Melting of the Charge-Density-Wave State in1T−TiSe2

et al. 2003

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We report a Raman scattering study of low-temperature, pressure-induced melting of the CDW phase of 1T-TiSe2. Our Raman scattering measurements reveal that the collapse of the CDW state occurs in three stages: (i) For P<5 kbar, the pressure dependence of the CDW amplitude mode energies and intensities are indicative of a "crystalline" CDW regime; (ii) for 5 < P < 25 kbar, there is a decrease in the CDW amplitude mode energies and intensities with increasing pressure that suggests a regime in which the CDW softens, and may decouple from the lattice; and (iii) for P>25 kbar, the absence of amplitude modes reveals a melted CDW regime. PACS numbers: 71.30.+h; 71.45.Lr; There has been a great deal of interest in the relationship between various diverse and exotic low temperature phases of strongly correlated systems, including the antiferromagnetic insulating and unconventional superconducting phases of the high T c cuprates,[1] the chargeordered insulating and ferromagnetic metal phases of the manganese perovskites,[2] the orbital-ordered and ferromagnetic metal phases of the ruthenates, [3,4,5] and the charge-density-wave (CDW) and superconducting phases of layered dichalcogenides such as 2H-NbSe 2 .[6] Of particular interest is the exotic phase behavior that is expected between fully-ordered (crystalline) and disordered (isotropic) phases as one tunes the interactions in these systems using some control parameter other than temperature. These include, for example, electronically phase-separated regimes, [2] and "quantum liquid crystal" smectic and nematic phases, which are expected to be observed between charge-ordered insulating and 'disordered' metallic or superconducting phases as one increases the interactions between the charge stripes. [7] Clearly, therefore, it is of great interest to carefully explore the manner in which quantum ordered phases collapse, or 'melt', into quantum disordered phases as a function of some control parameter that tunes the competing interactions in the material at low temperatures.In this paper, we report a pressure-dependent low temperature Raman scattering study of the CDW system 1T-TiSe 2 , in which we are able to explore the manner in which the CDW state 'melts' with increasing pressure near T∼0 K. Because of its layered structure and simple commensurate CDW phase, 1T-TiSe 2 is an ideal system for such an investigation. 1T-TiSe 2 is also of interest because the CDW transition is not driven by conventional Fermi surface nesting, but rather by an unconventional mechanism involving electron-hole coupling and an "indirect" Jahn-Teller effect.[8] Our low-temperature, pressure-dependent light scattering approach allows us to explore unique details associated with quantum mechanical melting of the CDW in 1T-TiSe 2 . In particular, this study reveals that the CDW state evolves with increasing pressure in a manner reminiscent of classical 2D melting, with 'crystalline' and 'disordered' regimes, as well as an intermediate 'soft' CDW regime in which the CDW may be incommensurate with the...

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Quantum Melting of the Charge-Density-Wave State in1T−TiSe2

et al. 2003

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“…Such a variation of ᠨ w must be provided by phase slip, but the corresponding CDW deformations in Fig. 3a have the wrong sign [19]. This contradiction means that NAR results from a variation of K ϵ I CDW ͞ ᠨ w rather than from a variation of the CDW velocity only.…”

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confidence: 94%

Negative Resistance and Local Charge-Density-Wave Dynamics

et al. 2001

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Charge-density-wave (CDW) dynamics is studied on a submicron length scale in NbSe 3 and o-TaS 3 . Regions of negative absolute resistance are observed in the CDW sliding regime at sufficiently low temperatures. The origin of the negative resistance is attributed to the different forces that the deformed CDW and quasiparticles feel: the force on the CDW is merely caused by a difference of the electric potentials, while the quasiparticle current is governed by a difference of the electrochemical potentials. DOI: 10.1103/PhysRevLett.87.126401 PACS numbers: 71.45.Lr, 72.15.Nj A periodic modulation of the conduction electron density is commonly observed in low-dimensional conductors [1]. This charge-density-wave (CDW) state is the ground state in various inorganic and organic materials with a chainlike structure, giving rise to remarkable electrical properties [2,3]. A particularly interesting feature of the CDW is its collective transport mode, somewhat similar to superconductivity [4]. Under an applied electric field, CDWs slide along the crystal, giving rise to a strongly nonlinear conductivity. Since even a small amount of disorder pins the CDWs, sliding occurs only when the applied electric field exceeds a certain threshold.In metallic and superconducting devices, reduction of sizes has revealed a variety of new mesoscopic phenomena. For CDW conductors, the mesoscopic regime has only been studied for small transverse dimensions [5][6][7] because samples of (sub)micron sizes in the chain direction could not be fabricated in a controlled way. Consequently, many aspects of microscopic CDW dynamics are still unknown. Nevertheless, some early studies on a micronscale revealed interesting mesoscopic features related to the CDW phase distribution [8,9]. More recently, artificial submicron CDW devices have been fabricated [10,11].In this paper, we present current-voltage (IV ) characteristics recorded on high-quality NbSe 3 and TaS 3 crystals with probe spacings in the submicron range (see the inset of Fig. 1). On these short length scales, IV curves vary strongly from segment to segment. For some segments the absolute resistance becomes negative, indicating that the moving CDW pumps single-particle carriers in a direction opposite to that of the rest of the sample. Our results show that the micron scale is the typical length scale for this new phenomenon in CDW dynamics.Experiments were carried out on single NbSe 3 and o-TaS 3 crystals with cross sections of 0.2 to 1 mm 2 . Both materials have a very anisotropic, chainlike structure [2]. NbSe 3 exhibits CDW transitions at T P1 145 K and T P2 59 K. At low temperatures a small portion of the conduction electrons remains uncondensed, providing a metallic single-particle channel. In contrast, in o-TaS 3 all electrons condense into the CDW state. As a result, the linear resistance shows semiconducting behavior below the transition temperature of 220 K.A common technique to contact small CDW whiskers consists of putting the crystals on top of metal probes that are evapor...

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