Constituents of the Quasiparticle Spectrum Along the Nodal Direction of High-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>T</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:math>Cuprates

Kordyuk, A. A.; Борисенко, С. В.; Zabolotnyy, V. B.; Geck, J.; Knupfer, M.; Fink, J.; Büchner, B.; Lin, C. T.; Keimer, B.; Berger, H.; Pan, Alexey V.; Komiya, Seiki; Ando, Yoichi

doi:10.1103/physrevlett.97.017002

Cited by 109 publications

(161 citation statements)

References 22 publications

(22 reference statements)

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“…Below T c , nodal values between 0.7 and 0.9 are reported for Bi-2212 in Ref. 83. For optimally doped Bi-2223, a recent study 84 allows us to estimate a nodal renormalization of 0.6 at 10 K. These numbers are very close to our superconducting-state results of Fig.…”

Section: Coupling Strength and Renormalization Factorssupporting

confidence: 80%

“…Indeed, the average renormalization in the normal state of Bi-2223 at optimal doping was estimated by fitting a model with a bosonic spectrum to optical data, 43 and leads to the values 2.18 and 1.75, depending on whether the full bosonic spectrum or its low-energy part is taken into account, respectively. In the normal state, but at the nodal point, a renormalization decreasing from 0.8 to 0.55 as a function of increasing hole doping was measured in Bi-2212 at 120 K. 83 Our nodal values for Bi-2223 in the normal state with s = 25 meV draw a similar trend, decreasing from 0.8 to 0.5 with decreasing gap size. Below T c , nodal values between 0.7 and 0.9 are reported for Bi-2212 in Ref.…”

Section: Coupling Strength and Renormalization Factorssupporting

confidence: 58%

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Strong-coupling analysis of scanning tunneling spectra in Bi2Sr2Ca2Cu
Berthod
¹
,
Fasano
²
,
Maggio-Aprile
³

et al. 2013
Phys. Rev. B

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We study a series of spectra measured in the superconducting state of optimally doped Bi 2 Sr 2 Ca 2 Cu 3 O 10+δ (Bi-2223) by scanning tunneling spectroscopy. Each spectrum, as well as the average of spectra presenting the same gap, is fitted using a strong-coupling model taking into account the band structure, the BCS gap, and the interaction of electrons with the spin resonance. After describing our measurements and the main characteristics of the strong-coupling model, we report the whole set of parameters determined from the fits, and we discuss trends as a function of the gap magnitude. We also simulate angle-resolved photoemission spectra, and compare with recent experimental results.

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Section: Coupling Strength and Renormalization Factorssupporting

confidence: 80%

Section: Coupling Strength and Renormalization Factorssupporting

confidence: 58%

Strong-coupling analysis of scanning tunneling spectra in Bi2Sr2Ca2Cu
Berthod
¹
,
Fasano
²
,
Maggio-Aprile
³

et al. 2013
Phys. Rev. B

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“…Perhaps the most discussed are the dispersion renormalizations in the nodal and anti-nodal regions of the Brillouin zone revealed by ARPES. [12][13][14][15][16][17][18][19] These manifest as sharp changes or "kinks" in the electronic band dispersion, which are generally believed to be due to coupling to a sharp bosonic mode. Although the identity of this mode (be it an electronic collective mode or one or more phonon modes) remains controversial, the appearance of the dispersion renormalizations at multiple energy scales ranging from 10 -110 meV strongly suggests coupling to a spectrum of oxygen phonons.…”

Section: Introductionmentioning

confidence: 99%

Determinant quantum Monte Carlo study of the two-dimensional single-band Hubbard-Holstein model

et al. 2013

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We have performed numerical studies of the Hubbard-Holstein model in two dimensions using determinant quantum Monte Carlo (DQMC). Here we present details of the method, emphasizing the treatment of the lattice degrees of freedom, and then study the filling and behavior of the fermion sign as a function of model parameters. We find a region of parameter space with large Holstein coupling where the fermion sign recovers despite large values of the Hubbard interaction. This indicates that studies of correlated polarons at finite carrier concentrations are likely accessible to DQMC simulations. We then restrict ourselves to the half-filled model and examine the evolution of the antiferromagnetic structure factor, other metrics for antiferromagnetic and charge-density-wave order, and energetics of the electronic and lattice degrees of freedom as a function of electron-phonon coupling. From this we find further evidence for a competition between charge-density-wave and antiferromagnetic order at half-filling.

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“…At higher energies, ARPES measurements suggest that the quasiparticles are coupled to bosonic excitations with energies up to at least 300 meV (ref. 24). This would match the high-energy tail of the collective spin excitations in Fig.…”

mentioning

confidence: 99%

Two energy scales in the spin excitations of the high-temperature superconductor La2−xSrxCuO4

et al. 2007

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The excitations responsible for producing high-temperature superconductivity in the copper oxides have yet to be identified. Two promising candidates are collective spin excitations and phonons 1 . A recent argument against spin excitations is based on their inability to explain structures observed in electronic spectroscopies such as photoemission 2-5 and optical conductivity 6,7 . Here, we use inelastic neutron scattering to demonstrate that collective spin excitations in optimally doped La 2−x Sr x CuO 4 are more structured than previously thought. The excitations have a two-component structure with a lowfrequency component strongest around 18 meV and a broader component peaking near 40-70 meV. The second component carries most of the spectral weight and its energy matches structures observed in photoemission 2-5 in the range 50-90 meV. Our results demonstrate that collective spin excitations can explain features of electronic spectroscopies and are therefore likely to be strongly coupled to the electron quasiparticles.Since their discovery, considerable progress has been made in understanding the properties of the high-critical-temperature, T c , cuprate superconductors. We know, for example, that the superconductivity involves Cooper pairs, but with d-wave rather than the s-wave pairing of conventional Bardeen-CooperSchrieffer (BCS) superconductors. One outstanding issue is the pairing mechanism itself. For conventional superconductors, identifying the bosonic excitations that strongly couple to the electron quasiparticles played a pivotal role in confirming the phonon-mediated pairing mechanism 8,9 . In the case of the copper oxide superconductors, electronic spectroscopies such as angle-resolved photoemission (ARPES) and infrared optical conductivity measurements 6,7 have revealed structures in the lowenergy electronic excitations, which may reflect coupling to bosonic excitations. ARPES measurements on Bi 2 Sr 2 CaCu 2 O 8 , Bi 2 Sr 2 CuO 6 and La 2−x Sr x CuO 4 have shown rapid changes or 'kinks' in the quasiparticle dispersion, E(k), for energies in the range 50-80 meV (refs 2-5). These features in ARPES have been interpreted in terms of coupling to phonon modes 5 . However, the ARPES measurements do not distinguish between coupling to lattice and spin excitations. Identifying phonons as the strongly coupled bosons is not without its difficulties: we must explain what is special about the phonons in the cuprates; interactions with phonons do not naturally explain other important properties of the cuprates, such as the large linear temperature dependence of the normal-state resistivity at optimal doping and the origin of d-wave symmetry of the superconducting gap itself.The interpretation of the kinks and other features in electronic spectroscopies 2-7 in terms of coupling to collective spin excitations 10 has been hampered by the lack of magnetic spectroscopy data. Most neutron scattering data refer to YBa 2 Cu 3 O 6+x , a compound for which ARPES data are scarce. Although ARPES kinks have also been re...

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Constituents of the Quasiparticle Spectrum Along the Nodal Direction of High-TcCuprates

Cited by 109 publications

References 22 publications

Strong-coupling analysis of scanning tunneling spectra in Bi2Sr2Ca2Cu
Berthod
¹
,
Fasano
²
,
Maggio-Aprile
³

et al. 2013
Phys. Rev. B

Strong-coupling analysis of scanning tunneling spectra in Bi2Sr2Ca2Cu
Berthod
¹
,
Fasano
²
,
Maggio-Aprile
³

et al. 2013
Phys. Rev. B

Determinant quantum Monte Carlo study of the two-dimensional single-band Hubbard-Holstein model

Two energy scales in the spin excitations of the high-temperature superconductor La2−xSrxCuO4

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Constituents of the Quasiparticle Spectrum Along the Nodal Direction of High-TcCuprates

Cited by 109 publications

References 22 publications

Strong-coupling analysis of scanning tunneling spectra in Bi2Sr2Ca2CuBerthod1, Fasano2, Maggio-Aprile3 et al. 2013Phys. Rev. B

Strong-coupling analysis of scanning tunneling spectra in Bi2Sr2Ca2CuBerthod1, Fasano2, Maggio-Aprile3 et al. 2013Phys. Rev. B

Determinant quantum Monte Carlo study of the two-dimensional single-band Hubbard-Holstein model

Two energy scales in the spin excitations of the high-temperature superconductor La2−xSrxCuO4

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Product

Resources

About

Strong-coupling analysis of scanning tunneling spectra in Bi2Sr2Ca2Cu
Berthod
¹
,
Fasano
²
,
Maggio-Aprile
³

et al. 2013
Phys. Rev. B

Strong-coupling analysis of scanning tunneling spectra in Bi2Sr2Ca2Cu
Berthod
¹
,
Fasano
²
,
Maggio-Aprile
³

et al. 2013
Phys. Rev. B