Angle-resolved photoemission spectroscopy and optical renormalizations: Phonons or spin fluctuations

Schachinger, E.; Tu, Jiajing; Ćarbotte, J. P.

doi:10.1103/physrevb.67.214508

Cited by 69 publications

(68 citation statements)

References 64 publications

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“…It was also demonstrated by Schachinger et al 45 that any nonzero contribution to I 2 χ(ω) at some energy ω will result in an increase of the optical scattering rate. Consequently the bump observed in the optical scattering rate of PCO (Fig.…”

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confidence: 79%

Optical study of superconductingPr2CuOxwithx≃4

et al. 2014

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Superconducting Pr2CuOx, x ≃ 4 (PCO) films with T ′ structure and a Tc of 27 K have been investigated by various optical methods in a wide frequency (7 -55000 cm −1 ) and temperature (2 to 300 K) range. The optical spectra do not reveal any indication of a normal-state gap formation. A Drude-like peak centered at zero frequency dominates the optical conductivity below 150 K. At higher temperatures, it shifts to finite frequencies. The detailed analysis of the low-frequency conductivity reveals that the Drude peak and a far-infrared (FIR) peak centered at about 300 cm −1 persist at all temperatures. The FIR-peak spectral weight is found to grow at the expense of the Drude spectral weight with increasing temperature. The temperature dependence of the penetration depth follows a behavior typical for d-wave superconductors. The absolute value of the penetration depth for zero temperature is 1.6 µm, indicating a rather low density of the superconducting condensate.

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confidence: 79%

Optical study of superconductingPr2CuOxwithx≃4

et al. 2014

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“…In light of these suggestions there have been several attempts to determine α 2 F(ω) from ARPES data 18,38,39 . Inversion by Verga et al 38 was based on the imaginary part of the self-energy Σ 2 (ω), obtained from the real part Σ 1 (ω) through KramersKronig transformation.…”

Section: Inversion Of Arpes Datamentioning

confidence: 99%

Extracting the electron-boson spectral functionα2F(ω)from infrared and photoemission data using inverse theory

Dordevic

Homes

et al. 2005

Phys. Rev. B

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We present a new method of extracting electron-boson spectral function α 2 F(ω) from infrared and photoemission data. This procedure is based on inverse theory and will be shown to be superior to previous techniques. Numerical implementation of the algorithm is presented in detail and then used to accurately determine the doping and temperature dependence of the spectral function in several families of high-Tc superconductors. Principal limitations of extracting α 2 F(ω) from experimental data will be pointed out. We directly compare the IR and ARPES α 2 F(ω) and discuss the resonance structure in the spectra in terms of existing theoretical models.

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“…Although the reliability of these theories is under debate and the improvements of these theories are in progress, 7,8 it has not yet been seriously studied whether or not the kink in the quasiparticle state can be solely of electronic origin. We deal with this problem in the present letter and report the appearance of a kink due to long-range electron correlations in the two-dimensional (2D) Hubbard model for small doping concentrations.…”

Section: Recent High-resolution Photoemission Experimentsmentioning

confidence: 99%

Kink Structure in the Quasiparticle Band of Doped Hubbard Systems

Kakehashi

Fulde

2005

J. Phys. Soc. Jpn.

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By making use of the self-consistent projection operator method with high-momentum and high-energy resolutions, we find a kink structure in the quasiparticle excitation spectrum of the two-dimensional Hubbard model in the underdoped regime. The kink is caused by a mixing between the quasiparticle state and excitations with short-range antiferromagnetic order. We suggest that this might be the origin of the strong concentration dependence of the 'kink' found in La2−xSrxCuO4 (x = 0.03 − 0.07).KEYWORDS: kink, quasiparticle excitations, Hubbard model, ARPES, cuprate, LSCO Recent high-resolution photoemission experiments show that there is a well-defined 'kink' in the quasiparticle band dispersion of high-T c cuprates, whose energy scale is ω kink = 60 − 70 meV in both the normal and superconducting states.1-3 The kink along the nodal direction was found to have a universal feature, 2 i.e., the Fermi velocity v F in the low-energy region (|ω| < ω kink ) is not sensitive to the type of cuprates, doping concentration, and isotope substitution, 4 although v F in the high-energy regime (|ω| > ω kink ) strongly depends on the latter. Various theoretical explanations for the kink have been attempted from two different points of view. One type of theory relies on the coupling of an electronic quasiparticle to the spin fluctuation resonance mode observed in inelastic neutron scattering experiments.5, 6 Another relies on a coupling to phonons, particularly to the longitudinal optical phonon mode found in neutron experiments.2, 3 The latter approach raised again the fundamental question on the mechanism underlying high-T c superconductivity in cuprates, i.e., electron-or phononmediated. Although the reliability of these theories is under debate and the improvements of these theories are in progress, 7, 8 it has not yet been seriously studied whether or not the kink in the quasiparticle state can be solely of electronic origin. We deal with this problem in the present letter and report the appearance of a kink due to long-range electron correlations in the two-dimensional (2D) Hubbard model for small doping concentrations.The difficulty in the present problem is that the perturbation approach is not applicable to cuprates because of strong electron correlations. Therefore, advanced theories such as the Lanczos method, 9 the quantum Monte-Carlo (QMC) method, 10-12 and dynamical cluster approximation (DCA), 13,14 have been applied to the cuprate system. They clarified the global structure of the single-particle excitation spectrum in the 2D Hubbard model. A detailed structure of the low-energy excitations at low temperatures, however, has not been derived because of the limited resolutions in both momentum and energy and the limited range of intersite * E-mail address: yok@sci.u-ryukyu.ac.jp † E-mail address: fulde@mpipks-dresden.mpg.de electron correlations inherent in the cluster approaches.In particular, a high resolution is indispensable for theoretical investigations of the kink. In order to overcome these difficulties, we h...

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Angle-resolved photoemission spectroscopy and optical renormalizations: Phonons or spin fluctuations

Cited by 69 publications

References 64 publications

Optical study of superconductingPr2CuOxwithx≃4

Optical study of superconductingPr2CuOxwithx≃4

Extracting the electron-boson spectral functionα2F(ω)from infrared and photoemission data using inverse theory

Kink Structure in the Quasiparticle Band of Doped Hubbard Systems

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