Effect of chemical pressure on the charge density wave transition in rare-earth tritellurides<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>R</mml:mi><mml:msub><mml:mi mathvariant="normal">Te</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Ru, N.; Condron, Cathie L.; Margulis, George Y.; Shin, K. Y.; Laverock, J.; Dugdale, Stephen B; Toney, Michael F.; Fisher, I. R.

doi:10.1103/physrevb.77.035114

Cited by 190 publications

(96 citation statements)

References 26 publications

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“…A fluctuation regime, suppressing T CDW1 below the mean field transition temperature and out of which the CDW state emerges, is expected to exist at temperatures well above T CDW1 , particularly in our case, with a large ratio 2Δ 1 /k B T CDW1 ∼ 15 being approximately four times the canonical mean field value of 3.53 (2). Signatures of such CDW precursor effects were, indeed, observed by X-ray diffraction (13) and optical (IR) spectroscopy (18,20). Here, we also reveal the nature and symmetry properties of the fluctuations; our observations are compatible with the A 1g channel, which indicates the survival of the C 4 rotational symmetry of the pseudotetragonal phase.…”

Section: Resultssupporting

confidence: 73%

“…These excitations have similar intensity in aa and cc polarization configurations (defined in Materials and Methods), soften, and get stronger on approaching T CDW1 from higher temperatures. Above 300 K, the spectra are essentially temperature-independent, which is expected for a metal with an almost constant resistivity (13).…”

Section: Resultsmentioning

confidence: 84%

“…Below T CDW1 , the weak orthorhombicity along with the relatively large electron-phonon coupling (5) then tips the balance, and Q 1 aligns along c* rather than a*. Finally, on additional lowering, the temperature below T CDW2 Q 2 aligns along a*, because the Fermi surface along the c* direction is already fully gapped by the first transition (13,31).…”

Section: Discussionmentioning

confidence: 99%

“…For this band structure, Yao et al (5) studied the influence of band-filling and electron-phonon coupling strength on the charge ordering and established a strong coupling limit for the experimentally observed stripe-like CDW state. Additionally, the work by Johannes and Mazin (7) found that the Lindhard susceptibility has peaks of comparable size at the nesting vector Q* predicted from the band structure and the CDW ordering vector Q 1 , determined experimentally in RTe 3 (13) (Fig. 1C).…”

mentioning

confidence: 99%

“…Among them, the prototypical ErTe 3 (Materials and Methods) undergoes a first CDW transition at T CDW1 = 265 K followed by a second one at T CDW2 = 155 K, and it allows a robust access to its intrinsic CDW properties. The ordering vectors Q 1 and Q 2 are parallel to but incommensurate with the reciprocal lattice vectors c* jj c and a* jj a, respectively (11)(12)(13)(14)(15)(16)(17)(18)(19)(20). The electronic properties of these layered CDW compounds can be modeled by considering a single Te plane (Fig.…”

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Alternative route to charge density wave formation in multiband systems

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Lavagnini

Hackl

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

100

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Charge and spin density waves, periodic modulations of the electron, and magnetization densities, respectively, are among the most abundant and nontrivial low-temperature ordered phases in condensed matter. The ordering direction is widely believed to result from the Fermi surface topology. However, several recent studies indicate that this common view needs to be supplemented. Here, we show how an enhanced electron-lattice interaction can contribute to or even determine the selection of the ordering vector in the model charge density wave system ErTe 3 . Our joint experimental and theoretical study allows us to establish a relation between the selection rules of the electronic light scattering spectra and the enhanced electron-phonon coupling in the vicinity of band degeneracy points. This alternative proposal for charge density wave formation may be of general relevance for driving phase transitions into other brokensymmetry ground states, particularly in multiband systems, such as the iron-based superconductors.electron-phonon interactions | nonconventional mechanism | Raman spectroscopy | solid-solid phase transitions T he common view of charge density wave (CDW) formation was originally posed in the work by Kohn (1). Using Kohn's reasoning (1), the tendency to ordering is particularly strong in low dimensions, because the Fermi surface has parallel parts, referred to as nesting. This nesting leads to a divergence in the Lindhard susceptibility, determining the magnitude and direction of the ordering vector Q (2). This divergence in the electronic susceptibility is conveyed to the lattice by the electron-phonon coupling: a phonon softens to zero frequency at Q, and a static lattice distortion develops when the system enters the CDW state, a behavior known as the Kohn anomaly.However, several publications raise the question as to whether nesting alone is sufficient to explain the observed ordering direction Q (3-7), particularly in dimensions higher than 1D. A central question is whether the selection of the CDW ordering vector is always driven by an electronic instability or if the ordering vector could, instead, be determined by a lattice distortion driven by some other mechanism exploiting the role of the electron-phonon coupling. In the latter case, the selected ordering vector would not necessarily nest the Fermi surface. The importance of strongly momentum-dependent electron-phonon coupling on CDW formation was pointed out in refs. 3 and 4, where the relevance of the Fermi surface for determining the ordering vector was indeed found to decrease as the coupling strength increases. In a recent paper on inelastic X-ray scattering measurements on 2H-NbSe 2 , acoustic phonons were observed to soften to zero frequency over an extended region around the CDW ordering vector (8). The authors argue that this behavior is not consistent with a Kohn anomaly picture, where sharp dips are expected (8). Therefore, the phonon softening must be driven by another mechanism, which they identify as a wave vector-dependent e...

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Section: Resultssupporting

confidence: 73%

Section: Resultsmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Alternative route to charge density wave formation in multiband systems

Eiter

Lavagnini

Hackl

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

100

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Femtosecond Time‐ and Angle‐Resolved Photoemission as a Real‐time Probe of Cooperative Effects in Correlated Electron Materials

Kirchmann

Perfetti

Wolf

et al. 2010

Dynamics at Solid State Surfaces and Interfaces

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IntroductionMany-body and correlation effects in solid-state physics manifest in specific signatures of the electronic band structure. The interaction of electrons with elementary excitations of the solid results in renormalization of the single-particle band structure due to, for example, electron-phonon, electron-magnon, and electron-electron interactions. This is explained in more detail in Volume 2 (Chapter 2) and this volume (Chapter 8). In particular for highly correlated materials such as charge (or spin) density wave materials, Mott insulators, and superconductors, such many-body effects are key to understanding macroscopic properties, for example, the electrical conductivity. Due to competition of these correlations with thermal fluctuations, phase transitions to ordered ground states with broken symmetry occur with decreasing temperature. Below the respective critical temperatures, the electronic system gains stability by opening of a bandgap (see Volume 2, Chapter 1). Understanding these many-particle effects is one goal of present efforts in solid-state physics.From an experimental point of view, angle-resolved photoelectron spectroscopy (ARPES) is the method of choice to analyze the electronic band structure of a solid [1,2]. It retrieves the information on the electronic states from the energy and the momentum of the photoelectrons emitted by a monochromatic photon source (see Volume 2, Chapter 3). This conversion is possible because the kinetic energy of the photoelectron is related to the binding energy of the photohole left behind. Furthermore, the translational symmetry of the surface guaranties that the momentum component of the photoelectron and of the photohole parallel to the surface are identical. However, the photoelectron wave vector perpendicular to the surface is not conserved due to the photoemission process. This limitation can be overcome if the material has a quasi-two-dimensional band structure. In this case, the angle-dependent photoelectron intensity represents the spectral function A k ðvÞ multiplied by the Fermi-Dirac distribution f ðvÞ.

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Lattice Instability Induced Concerted Structural Distortion in Charged and van der Waals Layered GdTe₃

Dutta,

Chandra,

Maria

et al. 2023

Adv Funct Materials

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Structural mosaic of rare‐earth tri‐tellurides (RTe3) inlaid with non‐classical structural motifs like the 2D−polytelluride square nets has attracted immense attention owing to their enigmatic chemical bonding, unconventional structure, and harboring charge density wave (CDW) ground states. GdTe3, an archetypal RTe3, is a natural heterostructure of charged and van der Waals (vdW) layers, formed by intercalating vdW gap separated 2D square telluride nets [(Te2)−]n between the charged double corrugated slabs of n[GdTe]+. Here, he investigated the evolution of structural distortions along with the electrical and thermal transport properties of GdTe3 across its CDW transition through X‐ray pair distribution function analysis, thermal conductivity measurements, Raman spectroscopy and first principles theoretical calculations is investigated. The results reveal that the unusual structure of GdTe3 engenders a large anisotropic lattice thermal conductivity by concomitantly hampering the phonon propagation along parallel to the spark plasma sintering (SPS) pressing direction via chemical bonding hierarchy while facilitating phonon propagation along perpendicular to the SPS pressing direction through the metallic Te sheets and phason channel. The low lattice thermal conductivity is attributed to the strong vibrational anharmonicity caused by CDW‐induced concerted local lattice distortions of both Gd–Te slab and Te square net, and the robust electron–phonon coupling.

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Effect of chemical pressure on the charge density wave transition in rare-earth tritelluridesRTe3

Cited by 190 publications

References 26 publications

Alternative route to charge density wave formation in multiband systems

Alternative route to charge density wave formation in multiband systems

Femtosecond Time‐ and Angle‐Resolved Photoemission as a Real‐time Probe of Cooperative Effects in Correlated Electron Materials

Lattice Instability Induced Concerted Structural Distortion in Charged and van der Waals Layered GdTe₃

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Effect of chemical pressure on the charge density wave transition in rare-earth tritelluridesRTe3

Cited by 190 publications

References 26 publications

Alternative route to charge density wave formation in multiband systems

Alternative route to charge density wave formation in multiband systems

Femtosecond Time‐ and Angle‐Resolved Photoemission as a Real‐time Probe of Cooperative Effects in Correlated Electron Materials

Lattice Instability Induced Concerted Structural Distortion in Charged and van der Waals Layered GdTe3

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Lattice Instability Induced Concerted Structural Distortion in Charged and van der Waals Layered GdTe₃