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Yoshida, T.; Zhou, X. J.; Tanaka, Kiyohisa; Yang, Wanli; Hussain, Zahid; Shen, Zhi‐Xun; Fujimori, A.; Sahrakorpi, S.; Lindroos, M.; Markiewicz, R. S.; Bansil, Arun; Komiya, Seiki; Ando, Yoichi; Eisaki, H.; Kakeshita, T.; Uchida, S.

doi:10.1103/physrevb.74.224510

Cited by 261 publications

(315 citation statements)

References 30 publications

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“…Nonetheless, spin fluctuations appear as the most plausible driving mechanism for the anisotropic Fermi liquid breakdown. 48,49 . In the present LSCO x ¼ 0.23 sample, the area U ¼ 1.28 enclosed by the gapless excitations is somewhat larger than the number of carriers 48 n ¼ 1 þ x ¼ 1.23.…”

Section: Discussionmentioning

confidence: 99%

Anisotropic breakdown of Fermi liquid quasiparticle excitations in overdoped La2−xSrxCuO4

et al. 2013

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High-temperature superconductivity emerges from an un-conventional metallic state. This has stimulated strong efforts to understand exactly how Fermi liquids breakdown and evolve into an un-conventional metal. A fundamental question is how Fermi liquid quasiparticle excitations break down in momentum space. Here we show, using angle-resolved photoemission spectroscopy, that the Fermi liquid quasiparticle excitations of the overdoped superconducting cuprate La 1.77 Sr 0.23 CuO 4 is highly anisotropic in momentum space. The quasiparticle scattering and residue behave differently along the Fermi surface and hence the Kadowaki-Wood's relation is not obeyed. This kind of Fermi liquid breakdown may apply to a wide range of strongly correlated metal systems where spin fluctuations are present.

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Section: Discussionmentioning

confidence: 99%

Anisotropic breakdown of Fermi liquid quasiparticle excitations in overdoped La2−xSrxCuO4

et al. 2013

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“…It has also been demonstrated that the cuprates belong to a regime (of t and U ) where the second-order exchange interaction J 2 = 4t 4 /U 3 contributes to a spin-excitation dispersion along the antiferromagnetic zone boundary (AFZB) [6][7][8][9]. Moreover, it is known from band-structure calculations and experiments that the nextnearest-neighbor (diagonal) hopping integral t constitutes a non-negligible fraction of t [10]. Empirically [11], the superconducting transition scales with the ratio t /t whereas Hubbard-type models predict the opposite trend [12,13].…”

Section: Introductionmentioning

confidence: 99%

Damped spin excitations in a doped cuprate superconductor with orbital hybridization

Ivashko

Shaik

et al. 2017

Phys. Rev. B

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A resonant inelastic x-ray scattering study of overdamped spin excitations in slightly underdoped La 2−x Sr x CuO 4 (LSCO) with x = 0.12 and 0.145 is presented. Three high-symmetry directions have been investigated: (1) the antinodal (0,0) → ( 1 2 ,0), (2) the nodal (0,0) → ( 1 4 , 1 4 ), and (3) the zone-boundary direction ( 1 2 ,0) → ( 1 4 , 1 4 ) connecting these two. The overdamped excitations exhibit strong dispersions along (1) and (3), whereas a much more modest dispersion is found along (2). This is in strong contrast to the undoped compound La 2 CuO 4 (LCO) for which the strongest dispersions are found along (1) and (2). The t − t − t − U Hubbard model used to explain the excitation spectrum of LCO predicts-for constant U/t-that the dispersion along (3) scales with (t /t) 2 . However, the diagonal hopping t extracted on LSCO using single-band models is low (t /t ∼ −0.16) and decreasing with doping. We therefore invoked a two-orbital (d x 2 −y 2 and d z 2 ) model which implies that t is enhanced. This effect acts to enhance the zone-boundary dispersion within the Hubbard model. We thus conclude that hybridization of d x 2 −y 2 and d z 2 states has a significant impact on the zone-boundary dispersion in LSCO.

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“…41 , i.e., the magnitude of the pseudogap parameter∆ PG is particular large in the underdoped regime, and then it smoothly decreases upon increasing doping, in qualitative agreement with the ARPES experimental results 63 . This doping dependence of the pseudogap∆ PG (k) therefore leads to an evolution of the Fermi arcs with doping in cuprate superconductors [28][29][30][31][32] .…”

Section: A Doping Dependence Of Electron Spectrummentioning

confidence: 99%

“…In particular, as a direct method for probing the electron Fermi surface, the early ARPES measurements indicate that in the entire doping range, the underlying electron Fermi surface satisfies Luttinger's theorem [24][25][26][27] , i.e., the electron Fermi surface with the area is proportional to 1 − δ. Later, the ARPES experimental studies show that in the underdoped and optimally doped regimes, although the antinodal region of the electron Fermi surface is gapped out, leading to the notion that only part of the electron Fermi surface survives as the disconnected Fermi arcs around the nodes [28][29][30][31][32] , the underlying electron Fermi surface determined from the low-energy spectral weight still fulfills Luttinger's theorem in the entire doping range 32 . These ARPES experimental facts [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] on the other hand provide strong evidences supporting the notion of the charge-spin recombination 13,14 .…”

Section: Introductionmentioning

confidence: 99%

Electronic structure of cuprate superconductors in a full charge-spin recombination scheme

Feng

Kuang

Zhao

2015

Physica C: Superconductivity and its Applications

113

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A long-standing unsolved problem is how a microscopic theory of superconductivity in cuprate superconductors based on the charge-spin separation can produce a large electron Fermi surface. Within the framework of the kinetic-energy driven superconducting mechanism, a full charge-spin recombination scheme is developed to fully recombine a charge carrier and a localized spin into a electron, and then is employed to study the electronic structure of cuprate superconductors in the superconducting-state. In particular, it is shown that the underlying electron Fermi surface fulfills Luttinger's theorem, while the superconducting coherence of the low-energy quasiparticle excitations is qualitatively described by the standard d-wave Bardeen-Cooper-Schrieffer formalism. The theory also shows that the observed peak-dip-hump structure in the electron spectrum and Fermi arc behavior in the underdoped regime are mainly caused by the strong energy and momentum dependence of the electron self-energy.

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Systematic doping evolution of the underlying Fermi surface ofLa2−xSrxCuO4

Cited by 261 publications

References 30 publications

Anisotropic breakdown of Fermi liquid quasiparticle excitations in overdoped La2−xSrxCuO4

Anisotropic breakdown of Fermi liquid quasiparticle excitations in overdoped La2−xSrxCuO4

Damped spin excitations in a doped cuprate superconductor with orbital hybridization

Electronic structure of cuprate superconductors in a full charge-spin recombination scheme

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