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Razzoli, Elia; Drachuck, Gil; Keren, Amit; Radović, M.; Plumb, N. C.; Chang, J.; Huang, Yuan; Ding, Hong; Mesot, J.; Shi, M.

doi:10.1103/physrevlett.110.047004

Cited by 64 publications

(80 citation statements)

References 28 publications

(36 reference statements)

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“…In contrast, at low temperatures (To45 K), there is a gap in the electronic spectra, that is, the peak position at k F remains below E F . A similar gap exists in LSCO up to 8% doping 4 14 or Coulomb disorder effects are present 15 . EDCs extracted from Fig.…”

Section: Resultsmentioning

confidence: 98%

See 1 more Smart Citation

Comprehensive study of the spin-charge interplay in antiferromagnetic La2−xSrxCuO4

Drachuck¹,

Razzoli²,

Bazalitski³

et al. 2014

Nat Commun

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The origin of the pseudogap and its relationship with superconductivity in the cuprates remains vague. In particular, the interplay between the pseudogap and magnetism is mysterious. Here we investigate the newly discovered nodal gap in hole-doped cuprates using a combination of three experimental techniques applied to one, custom made, single crystal. The crystal is an antiferromagnetic La 2 À x Sr x CuO 4 with x ¼ 1.92%. We perform angleresolved photoemission spectroscopy measurements as a function of temperature and find: quasi-particle peaks, Fermi surface, anti-nodal gap and below 45 K a nodal gap. Muon spin rotation measurements ensure that the sample is indeed antiferromagnetic and that the doping is close, but below, the spin-glass phase boundary. We also perform elastic neutron scattering measurements and determine the thermal evolution of the commensurate and incommensurate magnetic order, where we find that a nodal gap opens well below the commensurate ordering at 140 K, and close to the incommensurate spin density wave ordering temperature of 30 K.

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Section: Resultsmentioning

confidence: 98%

“…R ecent low-temperature angle-resolved photoemission spectroscopy (ARPES) experiments on the underdoped cuprate superconductors indicate the presence of a fully gapped Fermi surface (FS) [1][2][3][4] ; even in the antiferromagnetic phase 5 . The natural candidates for opening such a gap are charge or spin density waves (SDW).…”

mentioning

confidence: 99%

Comprehensive study of the spin-charge interplay in antiferromagnetic La2−xSrxCuO4

Drachuck¹,

Razzoli²,

Bazalitski³

et al. 2014

Nat Commun

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“…[191,[341][342][343][344][345][346] On the electrondoped side, we have demonstrated that strong SDW order removes the holepocket from the nodal region in the underdoped system, and the total band gap (= ∆ 2 SDW + ∆ 2 dSC ) appears to be nodeless even though the underlying pairing maintains d-wave symmetry. [99,347] This explanation does not hold in the holedoped case, where a hole-pocket is present at any doping.…”

Section: Nodeless D-wave Gap Due To Competition With Sdwmentioning

confidence: 99%

Intermediate coupling model of the cuprates

Das

Markiewicz

Bansil

2014

Advances in Physics

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We review the intermediate coupling model for treating electronic correlations in the cuprates. Spectral signatures of the intermediate coupling scenario are identified and used to adduce that the cuprates fall in the intermediate rather than the weak or the strong coupling limits. A robust, 'beyond LDA' framework for obtaining wide-ranging properties of the cuprates via a GW-approximation based self-consistent self-energy correction for incorporating correlation effects is delineated. In this way, doping and temperature dependent spectra, from the undoped insulator to the overdoped metal, in the normal as well as the superconducting state, with features of both weak and strong coupling can be modeled in a material-specific manner with very few parameters. Efficacy of the model is shown by considering available spectroscopic data on electron and hole doped cuprates from angle-resolved photoemission (ARPES), scanning tunneling microscopy/spectroscopy (STM/STS), neutron scattering, inelastic light scattering, optical and other experiments. Generalizations to treat systems with multiple correlated bands such as the heavy-fermions, the ruthenates, and the actinides are discussed.

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“…Recent experiments on nanoscale YBCO islands have shown a small, but measurable, energy gap of size 20-40 µeV [172], which was subsequently theoretically identified to be due to a subdominant s-wave order supported on the island surfaces [173]. Gapped nodal quasiparticles have also been measured in the bulk in the deeply underdoped regime and seem to be connected to the pseudogap state above T c [174,175], but the origin of this gap is at present not understood. [153].…”

Section: D-wave Superconductorsmentioning

confidence: 99%

Dirac materials

Wehling¹,

Black‐Schaffer²,

Balatsky³

2014

Advances in Physics

940

864

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A wide range of materials, like d-wave superconductors, graphene, and topological insulators, share a fundamental similarity: their low-energy fermionic excitations behave as massless Dirac particles rather than fermions obeying the usual Schrödinger Hamiltonian. This emergent behavior of Dirac fermions in condensed matter systems defines the unifying framework for a class of materials we call "Dirac materials". In order to establish this class of materials, we illustrate how Dirac fermions emerge in multiple entirely different condensed matter systems and we discuss how Dirac fermions have been identified experimentally using electron spectroscopy techniques (angle-resolved photoemission spectroscopy and scanning tunneling spectroscopy). As a consequence of their common low-energy excitations, this diverse set of materials shares a significant number of universal properties in the lowenergy (infrared) limit. We review these common properties including nodal points in the excitation spectrum, density of states, specific heat, transport, thermodynamic properties, impurity resonances, and magnetic field responses, as well as discuss many-body interaction effects. We further review how the emergence of Dirac excitations is controlled by specific symmetries of the material, such as time-reversal, gauge, and spin-orbit symmetries, and how by breaking these symmetries a finite Dirac mass is generated. We give examples of how the interaction of Dirac fermions with their distinct real material background leads to rich novel physics with common fingerprints such as the suppression of back scattering and impurity-induced resonant states. PACS

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Evolution from a Nodeless Gap todx2−y2-Wave in UnderdopedLa2−

Cited by 64 publications

References 28 publications

Comprehensive study of the spin-charge interplay in antiferromagnetic La2−xSrxCuO4

Comprehensive study of the spin-charge interplay in antiferromagnetic La2−xSrxCuO4

Intermediate coupling model of the cuprates

Dirac materials

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