Direct Observation of Complete Fermi Surface, Imperfect Nesting, and Gap Anisotropy in the High-Temperature Incommensurate Charge-Density-Wave Compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>SmTe</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Gweon, G.-H.; Denlinger, Jonathan D.; Clack, J. A.; Allen, J. W.; Olson, C. G.; DiMasi, Elaine; Aronson, M. C.; Foran, Brendan; Lee, S.

doi:10.1103/physrevlett.81.886

Cited by 124 publications

(143 citation statements)

References 11 publications

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“…Such a gap reduction is also consistent with the ARPES data, 19 showing a gap of about 400 meV in CeTe 3 , 15,16 and a gap of 200 meV in SmTe 3 . 17 In recent ARPES experiments 18 a reduction of the maximum gap value with decreasing a was also observed for several compounds of the RTe 3 series. It is important to remark that, differently from ARPES where the maximum gap value can be determined, our optical estimate provides a sort of averaged value for the CDW gap over the whole FS.…”

Section: Discussionmentioning

confidence: 99%

“…That a significant part of the FS is gapped in the CDW phase, is confirmed by ARPES data from which the fraction of the ungapped FS can be estimated to be 10-20 %. [15][16][17][18] In this respect, the quantity ⌽ = P 2 / ͑ P 2 + S SP 2 ͒ is of interest, since it represents the ratio between the spectral weight [15][16][17][18] they at least qualitatively confirm that a large portion of FS is gapped. The difference between ARPES and optics, as far as the gapping of FS is concerned, may also be reconciled in part by taking into account the energy resolution of the ARPES data.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, the SP peak in each compound can be thought as composed by the superposition of several excitations, which mimic the continuous distribution of gap values, as observed by ARPES. [15][16][17][18][19] The remaining two high frequency HO's account for the optical ͑electronic interband͒ transitions.…”

Section: Discussionmentioning

confidence: 99%

“…17 Owing to the 2D character of these compounds, the gap is not isotropic and shows a wave-vector dependence. 16,17 In particular, since the vector q ជ does not nest the whole FS, there are parts of it which are not gapped. Therefore, the CDW state coexists with the metallic phase due to the free charge carriers in the ungapped regions of the FS.…”

Section: Introductionmentioning

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: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…It, however, is usually difficult to determine the absolute energy gap experimentally [3,17,[94][95][96][97][98], because photoemission is sensitive only to occupied electronic states and angle-resolved inverse photoemission lacks energy resolution sufficient for the precise determination of energy gaps. The CDW ground states in the surface systems have superstructures commensurate to the substrate lattice.…”

Section: Temperature Dependence Of the Electronic Structurementioning

confidence: 99%

Surface Peierls transition on Cu(001) covered with heavier p-block metals

Aruga

2006

Surface Science Reports

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The Cu(001) surface covered with submonolayer coverages of In and Sn undergoes phase transitions at around 350-400 K. The transition is associated with the surface electronic structure change between low-temperature gapped and high-temperature ungapped ones. The energy gap positions in the k space coincide with the surface Brillouine zone boundaries of the low-temperature phases. These observations imply that the phase transitions are classified into the Peierls-type charge density wave (CDW) phase transition. The CDW ground states are characterized by large overall CDW gaps and long CDW correlation lengths. Structural studies show that the transitions are associated with order-disorder processes. This suggests that these are in strong-coupling regime. However, the associated gapped-ungapped change suggests that the electronic terms play significant role, in contradiction with the strong-coupling scenario. Based on the results of recent works on precise temperature dependence of the CDW gap and critical X-ray scattering, the origin of this dual nature and the detailed mechanism of the phase transition is discussed. It is suggested that the electronic entropy of the CDW ground state is not governed by the overall energy gap but by the gap between the upper band minimum and the Fermi level of the whole system. The dual nature of the surface Peierls transition on Cu(001) originates, on one hand, from the existence at metal surfaces of the two characteristic energy gaps: the overall gap, which determines the CDW stabilization energy, and the upper gap, which governs the electronic entropy. On the other hand, the CDW correlation length is suggested to play another significant role in determining the nature of the Peierls transition. The classification of the Peierls transisions according to the CDW correlation length and the gap size is discussed. It is suggested that the surface Peierls transition on metal-covered Cu(001) covered with heavier p-block metallic elements are qualitatively different from both the weak-coupling CDW transition, with long CDW correlation length and small gaps, and the strong-coupling CDW transitions, with short correlation lengths and large gaps, and should be classified into the third class, which is characterized by long coherence and strong coupling.

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Hypervalenzbindung in einer, zwei und drei Dimensionen: Erweiterung des Zintl-Klemm-Konzepts auf nichtklassische elektronenreiche Netze

Papoian

Hoffmann

2000

Angewandte Chemie

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Direct Observation of Complete Fermi Surface, Imperfect Nesting, and Gap Anisotropy in the High-Temperature Incommensurate Charge-Density-Wave CompoundSmTe3

Cited by 124 publications

References 11 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

Surface Peierls transition on Cu(001) covered with heavier p-block metals

Hypervalenzbindung in einer, zwei und drei Dimensionen: Erweiterung des Zintl-Klemm-Konzepts auf nichtklassische elektronenreiche Netze

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