Fermi surface nesting and charge-density wave formation in rare-earth tritellurides

Laverock, J.; Dugdale, Stephen B; Major, Zs.; Alam, M. A.; Ru, N.; Fisher, I. R.; Santi, Gilles; Bruno, E.

doi:10.1103/physrevb.71.085114

Cited by 120 publications

(123 citation statements)

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“…Comparisons with several similarly-structured RTe 3 and RTe 2 systems [11,16,17,27] help paint a fuller picture. In both families of compounds, the Te layer is a common feature and CDWs exist along a major axis.…”

Section: Discussionmentioning

confidence: 99%

“…1a). The Fermi surface projected onto the a*-c* reciprocal space plane [17] potentially can support two degenerate CDWs along the a and c-axes, respectively (Fig. 1b), if the lattice is tetragonal.…”

mentioning

confidence: 99%

“…The layered metal-chalcogenide family has served as the historical prototype for a rich catalogue of low-dimensional charge-density-wave phenomena [5][6][7][8][9][10][11][12][13][14][15]. The rare earth tritelluride RTe 3 series (R=La to Tm) [10,13,14,[16][17][18][19][20][21][22][23][24][25][26] has emerged more recently as materials with extremely pliable Fermi surfaces [11] that permit multiple long-wavelength distortions, from CDW to magnetic order to superconductivity, separated by orders of magnitude in their energy scales [22].…”

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confidence: 99%

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Charge transfer and multiple density waves in the rare earth tellurides

et al. 2013

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Abstract:We use high-resolution synchrotron x-ray diffraction to uncover a second, lowtemperature, charge density wave (CDW) in TbTe 3 . Its T c2 = 41.0 ± 0.4 K is the lowest discovered so far in the rare earth telluride series. The CDW wave vectors of the high temperature and low temperature states differ significantly and evolve in opposite directions with temperature, indicating that the two nested Fermi surfaces are separated and the CDWs coexist independently. Both the in-plane and out-of-plane correlation lengths are robust, implying that the density waves on different Te layers are well coupled through the TbTe layers. Finally, we rule out any low-temperature CDW in GdTe 3 for temperatures above 8 K, an energy scale sufficiently low to make pressure tuning of incipient CDW order a realistic possibility.

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Section: Discussionmentioning

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Charge transfer and multiple density waves in the rare earth tellurides

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“…Although the high-temperature NS cannot be studied experimentally since T CDW is anticipated to be above the melting point of the material, we can nevertheless draw some predictions by exploiting our data and the bandstructure calculations. 13,14 The Te p x and p y orbitals have a strong 2D character ͑i.e., they have a negligible dispersion along the direction orthogonal to the Te layers͒. These bands are well approximated by a tight-binding model 15 in which, taking into account the stoichiometry, the Fermi level lies above half-filling ͑i.e., at 3.25 eV below the top of the bands͒, 29 indicating that charge carriers are holelike.…”

Section: Discussionmentioning

confidence: 99%

“…8 The rare-earth atom is trivalent for all members of the series 8 and thus the electronic structure is quite similar in all of them. Band structure calculations 9,13,14 reveal that the electronic bands at the Fermi level derive from the Te p x and p y in-plane orbitals, leading to a very simple FS, a large part of which is nested by a single wave vector q ជ = ͑0,x͒, x Ӎ 0.29a * ͑a * =2 / a͒ in the base plane of the reciprocal lattice. 14 This nesting appears to be the driving mechanism for the CDW instability.…”

Section: Introductionmentioning

confidence: 99%

Chemical pressure and hidden one-dimensional behavior in rare-earth tri-telluride charge-density wave compounds

et al. 2006

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We report on the first optical measurements of the rare-earth tri-telluride charge-density wave systems. Our data, collected over an extremely broad spectral range, allow us to observe both the Drude component and the single-particle peak, ascribed to the contributions due to the free charge carriers and to the charge-density wave gap excitation, respectively. The data analysis displays a diminishing impact of the charge-density wave condensate on the electronic properties with decreasing lattice constant across the rare-earth series. We propose a possible mechanism describing this behavior and we suggest the presence of a one-dimensional character in these two-dimensional compounds. We also envisage that interactions and umklapp processes might play a relevant role in the formation of the charge-density wave state in these compounds.

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

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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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Fermi surface nesting and charge-density wave formation in rare-earth tritellurides

Cited by 120 publications

References 21 publications

Charge transfer and multiple density waves in the rare earth tellurides

Charge transfer and multiple density waves in the rare earth tellurides

Chemical pressure and hidden one-dimensional behavior in rare-earth tri-telluride charge-density wave compounds

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

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