Fermi-surface analysis of a quasi-two-dimensional monophosphate tungsten bronze

Roca, L.; Mascaraque, A.; Ávila, J.; Drouard, S.; Guyot, H.; Asensio, M. C.

doi:10.1103/physrevb.69.075114

Cited by 5 publications

(4 citation statements)

References 24 publications

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“…These materials are electronically more complex since the FS follows the so-called hidden nesting scenario [209], i.e., the FS results from the hybridization of three different one-dimensional FS. This study, while confirming the qualitative aspects of the eH calculations, has led to a better agreement with recent ARPES studies [210,211]. Calculation of precise FS (including interlayer interactions) and the associated Lindhard response function allowed an indepth discussion of the origin of the structural modulations occurring in these materials.…”

Section: Molybdenum and Tungsten Oxides And Bronzessupporting

confidence: 66%

Computing the Properties of Materials from First Principles with SIESTA

Sánchez‐Portal

Ordejón

Canadell

Structure and Bonding

110

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Section: Molybdenum and Tungsten Oxides And Bronzessupporting

confidence: 66%

Computing the Properties of Materials from First Principles with SIESTA

Sánchez‐Portal

Ordejón

Canadell

Structure and Bonding

110

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“…Thus, we study only the simplest model for pinned two-dimensional charge density waves with the characteristic wave vector Q = (π, π) on a square lattice. Although realistic two-dimensional CDW ordering usually takes place in more complicated situations 12,13,14 , the main conclusions of the present paper can be qualitatively applicable to them as well. Thus, if the nesting condition is valid only on a part of the Fermi surface, just respective electrons will participate in the density wave ordering and the Q-reflection will take place for respective region of momentum directions.…”

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confidence: 69%

Low-energy quasiparticle states at superconductor/charge-density-wave interfaces

Bobkova

Barash

2005

Phys. Rev. B

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Quasiparticle bound states are found theoretically on transparent interfaces of d-wave superconductors (dSC) with charge density wave solids (CDW), as well as s-wave superconductors (sSC) with d-density waves (DDW). These bound states represent a combined effect of Andreev reflection from the superconducting side and an unconventional quasiparticle Q-reflection from the density wave solid. If the order parameter for a density wave state is much less than the Fermi energy, bound states with almost zero energy take place for an arbitrary orientation of symmetric interfaces. For larger values of the order parameter, dispersionless zero-energy states are found only on (110) interfaces. Two dispersive energy branches of subgap quasiparticle states are obtained for (100) symmetric interfaces. Andreev low-energy bound states, taking place in junctions with CDW or DDW interlayers, result in anomalous junction properties, in particular, the low-temperature behavior of the Josephson critical current. PACS numbers: 74.45.+c, 74.50.+r Introduction. Low-energy quasiparticle states play an important role in forming electron transport in mesoscopic hybrid superconducting systems at low temperatures. In transparent superconductor-normal metalsuperconductor (S-N-S) junctions, subgap states originate entirely in Andreev reflection processes. In the presence of finite interface transparencies, both Andreev and conventional reflections come into play in forming subgap bound states. Zero-energy Andreev surface states in d-wave superconductors also represent a combined effect of Andreev and specular quasiparticle reflections.

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“…The main question to answer at that moment was to what extent the undulation of the Fermi surface would indeed be compatible with a nesting mechanism, which requires flat areas in the Fermi surface. A comparison with well-known CDW compounds, such as NaMo 6 O 17 or KMo 6 O 17 , reveals that a large percentage of flat areas has always been required to stabilize a CDW [52][53][54][55][56]. In the case of Pb/Ge (111), it was concluded that both the theoretical and the experimental Fermi surfaces are undulated, but the fraction of flat areas is insufficient to obtain a significant energy gain associated with a CDW instability [25].…”

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confidence: 99%

The Fermi surface of Sn/Ge(111) and Pb/Ge(111)

Tejeda¹,

Cortés²,

Lobo³

et al. 2007

J. Phys.: Condens. Matter

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The analysis of the electronic structure and Fermi surface of 0.33 monolayers (ML) of Sn/Ge(111) and Pb/Ge(111) has played an important role in understanding the phase transition from a room-temperature ( √ 3 × √ 3)R30 • reconstruction to a (3 × 3) reconstruction below ∼200 K. Nowadays, the increasing resolution of image-type electron analysers enables us to obtain whole sets of constant-energy surfaces and energy-distribution curves. We review the electronic structure of Sn and Pb on Ge(111) and report highresolution angle-resolved photoemission data for Sn/Ge(111)-(3 × 3) at 110 K. The results exclude nesting or any opening of a gap in the (3 × 3) phase at this temperature. From a comparison with density functional theoretical calculations, we conclude that the results on the electronic structure are only compatible with a (3 × 3) unit cell with one Sn atom displaced upward from the other two.

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Fermi-surface analysis of a quasi-two-dimensional monophosphate tungsten bronze

Cited by 5 publications

References 24 publications

Computing the Properties of Materials from First Principles with SIESTA

Computing the Properties of Materials from First Principles with SIESTA

Low-energy quasiparticle states at superconductor/charge-density-wave interfaces

The Fermi surface of Sn/Ge(111) and Pb/Ge(111)

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