Fluctuation effects on the electrodynamics of quasi-one-dimensional conductors above the charge-density-wave transition

Schwartz, A.; Dressel, Martin; Alavi, B.; Blank, Aharon; DuBois, Steven G.; Grüner, G.; Gorshunov, B.; Волков, А. А.; Козлов, Г. В.; Thieme, St.; Degiorgi, L.; Lévy, F.

doi:10.1103/physrevb.52.5643

Cited by 64 publications

(43 citation statements)

References 38 publications

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“…6). We remark that this is a rather common situation in prototype CDW materials [3]. The persistence of the gap above the phase transition temperature can be considered as a fingerprint of precursor effects of the CDW formation and has been widely invoked as a manifestation of the fluctuation regime [3].…”

Section: Discussionmentioning

confidence: 79%

Temperature dependence of the excitation spectrum in the charge-density-waveErTe3andHoTe3systems

Pfuner

Lerch

et al. 2010

Phys. Rev. B

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We provide optical reflectivity data collected over a broad spectral range and as a function of temperature on the ErTe 3 and HoTe 3 materials, which undergo two consecutive charge-density-wave (CDW) phase transitions at T CDW 1 = 265 and 288 K and at T CDW 2 = 157 and 110 K, respectively.We observe the temperature dependence of both the Drude component, due to the itinerant charge carriers, and the single-particle peak, ascribed to the charge-density-wave gap excitation. The CDW gap progressively opens while the metallic component gets narrow with decreasing temperature. An important fraction of the whole Fermi surface seems to be affected by the CDW phase transitions. It turns out that the temperature and the previously investigated pressure dependence of the most relevant CDW parameters share several common features and behaviors. Particularly, the order parameter of the CDW state is in general agreement with the predictions of the BCS theory.

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Section: Discussionmentioning

confidence: 79%

Temperature dependence of the excitation spectrum in the charge-density-waveErTe3andHoTe3systems

Pfuner

Lerch

et al. 2010

Phys. Rev. B

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“…45 This is consistent with the surprising identification of a pseudogap in the canonical sliding CDW system, the blue bronzes. 10 We illustrate in Fig. 8 the convergence of strong-and weak-coupling paradigms with high-temperature resistivity data for Cr 1−x V x , La 1−x Ca x MnO 3 , and ͑Rb 1−x K x ͒ 0.3 MoO 3 .…”

Section: Discussion: Weak Versus Strong Couplingmentioning

confidence: 88%

“…Yet, the demarcation between weak and strong coupling is not clean cut. It is possible to simultaneously observe seemingly contradictory phenomena in many of these compounds: sliding charge density waves and pseudogaps in the canonical CDW system, the blue bronzes; 10 spin fluctuations with energies of electron volts and long-coherence-length SDW modulation in the simple elemental antiferromagnet, Cr ͑Ref. 11͒; stripe order on nanometer scales and extended charge density waves in the poster child for local charge fluctuations, the lanthanum manganites.…”

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confidence: 99%

Chromium at high pressures: Weak coupling and strong fluctuations in an itinerant antiferromagnet

et al. 2008

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The spin-and charge-density-wave order parameters of the itinerant antiferromagnet chromium are directly measured with nonresonant x-ray diffraction as the system is driven toward its quantum critical point with high pressure using a diamond anvil cell. The exponential decrease of the spin and charge diffraction intensities with pressure confirms the harmonic scaling of spin and charge, while the evolution of the incommensurate ordering vector provides important insight into the difference between pressure and chemical doping as means of driving quantum phase transitions. Measurement of the charge density wave over more than two orders of magnitude of diffraction intensity provides the clearest demonstration to date of a weakly coupled BCS-type ground state. Evidence for the coexistence of this weakly coupled ground state with high-energy excitations and pseudogap formation above the ordering temperature in chromium, the charge-ordered perovskite manganites, and the blue bronzes, among other such systems, raises fundamental questions about the distinctions between weak and strong coupling.

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“…22,23 The oscillator strength is observed at a finite frequency due to a CDW collective mode. In the case of TaTe 4 , however, a Drude peak is observed in the CDW phase, suggesting that not all conduction electrons near the chemical potential are lost due to the CDW formation.…”

Section: Discussionmentioning

confidence: 99%

Coexisting one-dimensional and three-dimensional spectral signatures inTaTe4

et al. 1999

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Using angle-resolved photoemission spectroscopy, we probe the electronic band structure of TaTe 4 single crystal samples. Resistivity and optical measurements were also performed on the same samples. The experimental data indicate a combination of quasi-one-dimensional and three-dimensional electronic properties. We observe a finite spectral intensity, but no dispersing quasiparticle states near the chemical potential.

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Fluctuation effects on the electrodynamics of quasi-one-dimensional conductors above the charge-density-wave transition

Cited by 64 publications

References 38 publications

Temperature dependence of the excitation spectrum in the charge-density-waveErTe3andHoTe3systems

Temperature dependence of the excitation spectrum in the charge-density-waveErTe3andHoTe3systems

Chromium at high pressures: Weak coupling and strong fluctuations in an itinerant antiferromagnet

Coexisting one-dimensional and three-dimensional spectral signatures inTaTe4

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