Fermi surface reconstruction in CeTe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>induced by charge density waves investigated via angle resolved photoemission

Kang, J.-S.; Kim, D. H.; Lee, Hongjoo J.; Hwang, Jihyun; Lee, Han-Koo; Kim, H.-D.; Min, Baehyun; Lee, K. E.; Kwon, Yong Seung; Kim, J. W.; Kim, Kyoo; Kim, B. H.; Min, B. I.

doi:10.1103/physrevb.85.085104

Cited by 19 publications

(11 citation statements)

References 22 publications

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“…3(a) , which are reversed in the first and second BZ, respectively, arise partly from the band folding due to the interaction of Te(2)-Te(3) bilayers with neighboring R -Te(1) layers. Such features are well established in literature 16 19 30 Then, the additional band folding on top of it arises from the CDW supercell structure. The measured FS in Fig.…”

Section: Resultsmentioning

confidence: 62%

“…The dichroic ARPES image plots for PrTe 3 reveal several features. (i) Very dispersive bands are observed in ARPES of PrTe 3 and the large-energy-scale band structures of PrTe 3 are very similar to those of R Te 2 ( R = Ce, Pr) 30 42 . (ii) The effects of both the LD and CD are observed clearly.…”

Section: Resultsmentioning

confidence: 84%

“…Then, due to the partial filling, the square nets of two Te(2)-Te(3) planes are easily distorted by the Peierls-like mechanism 27 . Band-structure calculations for a similar CDW system of R Te 2 , which has only one partially-filled Te sheet, indicate that the CDW instability occurs from the FS nesting of the Te square sheets in the ab plane 24 28 29 30 31 .…”

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confidence: 99%

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The 7 × 1 Fermi Surface Reconstruction in a Two-dimensional f -electron Charge Density Wave System: PrTe3

Lee

Kim

et al. 2016

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The electronic structure of a charge density wave (CDW) system PrTe3 and its modulated structure in the CDW phase have been investigated by employing ARPES, XAS, Pr 4 f RPES, and first-principles band structure calculation. Pr ions are found to be nearly trivalent, supporting the CDW instability in the metallic Te sheets through partial filling. Finite Pr 4 f spectral weight is observed near the Fermi level, suggesting the non-negligible Pr 4 f contribution to the CDW formation through the Pr 4 f -Te 5p hybridization. The two-fold symmetric features in the measured Fermi surface (FS) of PrTe3 are explained by the calculated FS for the assumed 7 × 1 CDW supercell formation in Te sheets. The shadow bands and the corresponding very weak FSs are observed, which originate from both the band folding due to the 3D interaction of Te sheets with neighboring Pr-Te layers and that due to the CDW-induced FS reconstruction. The straight vertical FSs are observed along kz, demonstrating the nearly 2D character for the near-EF states. The observed linear dichroism reveals the in-plane orbital character of the near-EF Te 5p states.

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Section: Resultsmentioning

confidence: 62%

Section: Resultsmentioning

confidence: 84%

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confidence: 99%

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The 7 × 1 Fermi Surface Reconstruction in a Two-dimensional f -electron Charge Density Wave System: PrTe3

Lee

Kim

et al. 2016

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“…As stated above, nonstoichiometric Ln Sb x Te 2− x − δ as well as stoichiometric Ln Te 2 can be structurally distorted, which has been related to charge density wave (CDW) formations . For an ideal 1D linear chain with a half filling, the lattice can undergo a Peierls distortion at the cost of elastic energy and form a CDW at low temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Such a study is critical because Ln SbTe phases (with Ln = Lanthanide) are likely to undergo lattice distortions, especially when they are nonstoichiometric. One good example is the rare‐earth ditellurides ( Ln Te 2 ), whose structural distortions have been heavily studied. So far, GdSbTe has not been investigated for possible nonstoichiometry or structural instabilities.…”

Section: Introductionmentioning

confidence: 99%

Charge Density Waves and Magnetism in Topological Semimetal Candidates GdSb_xTe₂₋_x₋_δ

et al. 2019

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Many topological semimetals are known to exhibit exceptional electronic properties, which are the fundamental basis for design of novel devices and further applications. Materials containing the structural motif of a square net are known to frequently be topological semimetals. In this work, the synthesis and structural characterization of the square‐net‐based magnetic topological semimetal candidates GdSbxTe2−x−δ (0≤x≤1, δ indicating the vacancy level) are reported. The structural evolution of the series with Sb substitution is studied, finding a transition between a simple tetragonal square‐net structure to complex superstructure formations due to the presence of charge density waves. The structural modulations coincide with a significant modification of the magnetic order. This work thus establishes GdSbxTe2−x−δ as a platform to study the interplay between crystal symmetry, band filling, charge density wave, and magnetism in a topological semimetal candidate.

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Charge density wave and weak Kondo effect in a Dirac semimetal CeSbTe

Fang

et al. 2021

Sci. China Phys. Mech. Astron.

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Using angle-resolved photoemission spectroscopy (ARPES) and low-energy electron diffraction (LEED), together with densityfunctional theory (DFT) calculation, we report the formation of charge density wave (CDW) and its interplay with the Kondo effect and topological states in CeSbTe. The observed Fermi surface (FS) exhibits parallel segments that can be well connected by the observed CDW ordering vector, indicating that the CDW order is driven by the electron-phonon coupling (EPC) as a result of the nested FS. The CDW gap is large (~0.3 eV) and momentum-dependent, which naturally explains the robust CDW order up to high temperatures. The gap opening leads to a reduced density of states (DOS) near the Fermi level (E F ), which correspondingly suppresses the many-body Kondo effect, leading to very localized 4f electrons at 20 K and above. The topological Dirac cone at the X point is found to remain gapless inside the CDW phase. Our results provide evidence for the competition between CDW and the Kondo effect in a Kondo lattice system. The robust CDW order in CeSbTe and related compounds provide an opportunity to search for the long-sought-after axionic insulator.

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Fermi surface reconstruction in CeTe2induced by charge density waves investigated via angle resolved photoemission

Cited by 19 publications

References 22 publications

The 7 × 1 Fermi Surface Reconstruction in a Two-dimensional f -electron Charge Density Wave System: PrTe3

The 7 × 1 Fermi Surface Reconstruction in a Two-dimensional f -electron Charge Density Wave System: PrTe3

Charge Density Waves and Magnetism in Topological Semimetal Candidates GdSb_xTe₂₋_x₋_δ

Charge density wave and weak Kondo effect in a Dirac semimetal CeSbTe

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Fermi surface reconstruction in CeTe2induced by charge density waves investigated via angle resolved photoemission

Cited by 19 publications

References 22 publications

The 7 × 1 Fermi Surface Reconstruction in a Two-dimensional f -electron Charge Density Wave System: PrTe3

The 7 × 1 Fermi Surface Reconstruction in a Two-dimensional f -electron Charge Density Wave System: PrTe3

Charge Density Waves and Magnetism in Topological Semimetal Candidates GdSbxTe2−x−δ

Charge density wave and weak Kondo effect in a Dirac semimetal CeSbTe

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Charge Density Waves and Magnetism in Topological Semimetal Candidates GdSb_xTe₂₋_x₋_δ