Electronic Structure of Lanthan Ditellurides

Kikuchi, Akihito

doi:10.1143/jpsj.67.1308

Cited by 61 publications

(68 citation statements)

References 8 publications

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“…The warping of FS would loose its relevance only at Ͼ t perp . However, this is not the appropriate situation for RTe 3 , since t perp = 0.37 eV, 13,15 while the power-law behavior is observed for frequencies Ͼ 0.2 eV. But if nesting is strong and occurs with a well-defined q ជ vector, then the system still acts as a 1D system would essentially do.…”

Section: Discussionmentioning

confidence: 96%

“…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%

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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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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

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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“…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%

“…In both families of compounds, the Te layer is a common feature and CDWs exist along a major axis. The theoretical band structure calculations for LaTe 2 [27] mandate a charge transfer of one electron from the LaTe layer to the Te layer, and find that this charge transfer is necessary for the formation of a CDW state in the Te layer. In a band structure calculation for LuTe 3 [16], a one-electron charge transfer from the RTe layer to the double Te layers is assumed a priori.…”

Section: Discussionmentioning

confidence: 99%

“…Both the a-axis lattice constant and the CDW order parameter indicate a continuous phase transition for the low temperature CDW in TbTe 3 . Although the formation of the CDW was previously postulated to arise solely from the two-dimensional p x and p z orbitals of Te layers within the a-c plane [16,26,27], our results indicate that changes in the strength and wave vectors of the CDW, as well as the existence of a second CDW in various RTe 3 compounds, need to take into account charge transfer between the RTe and Te layers as the baxis lattice constant shrinks with changing rare earth element. We believe that this charge transfer effect might similarly be responsible for influencing the CDW states in both La(Te 1-x Sb x ) 2 [11] and pressure-tuned LaTe 3 [21].…”

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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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Advances in Rare‐Earth Tritelluride Quantum Materials: Structure, Properties, and Synthesis

Yumigeta

Qin

et al. 2021

Advanced Science

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A distinct class of 2D layered quantum materials with the chemical formula of RTe3 (R = lanthanide) has gained significant attention owing to the occurrence of collective quantum states, superconductivity, charge density waves (CDW), spin density waves, and other advanced quantum properties. To study the Fermi surface nesting driven CDW formation, the layered RTe3 family stages an excellent low dimensional genre system. In addition to the primary energy gap feature observed at higher energy, optical spectroscopy study on some RTe3 evidence a second CDW energy gap structure indicating the occurrence of multiple CDW ordering even with light and intermediate RTe3 compounds. Here, a comprehensive review of the fundamentals of RTe3 layered tritelluride materials is presented with a special focus on the recent advances made in electronic structure, CDW transition, superconductivity, magnetic properties of these unique quantum materials. A detailed description of successful synthesis routes including the flux method, self‐flux method, and CVT along with potential applications is summarized.

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Electronic Structure of Lanthan Ditellurides

Cited by 61 publications

References 8 publications

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

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

Charge transfer and multiple density waves in the rare earth tellurides

Advances in Rare‐Earth Tritelluride Quantum Materials: Structure, Properties, and Synthesis

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