Nodal Landau Fermi-liquid quasiparticles in overdoped La<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow /><mml:mrow><mml:mn>1.77</mml:mn></mml:mrow></mml:msub></mml:math>Sr<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow /><mml:mrow><mml:mn>0.23</mml:mn></mml:mrow></mml:msub></mml:math>CuO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow /><mml:mn>4</mml:mn></mml:msub></mml:math>

Fatuzzo, C. G.; Sassa, Yasmine; Må̊nsson, Martin; Pailhés, S.; Lipscombe, O. J.; Hayden, Stephen M; Patthey, L.; Shi, M.; Grioni, M.; Rønnow, Henrik M.; Mesot, J.; Tjernberg, Oscar; Chang, J.

doi:10.1103/physrevb.89.205104

Cited by 14 publications

(15 citation statements)

References 36 publications

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“…with v F and v b F being dressed and bare Fermi velocities [56]. Assuming an isotropic FL and using v b F = 2.34 eVÅ, the QP residue yields Z = v F /v b F = 0.26(4), consistent with DMFT that finds Z xz = 0.23.…”

supporting

confidence: 55%

Orbitally selective breakdown of Fermi liquid quasiparticles in Ca1.8Sr0.2RuO4

et al. 2019

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We present a comprehensive angle-resolved photoemission spectroscopy study of Ca1.8Sr0.2RuO4. Four distinct bands are revealed and along the Ru-O bond direction their orbital characters are identified through light polarisation analysis and comparison to dynamical mean field theory calculations. Bands assigned to dxz, dyz orbitals display Fermi liquid behavior with four-fold quasi particle mass renormalization. Extremely heavy Fermions -associated with a predominantly dxy band character -are shown to display non-Fermi liquid behavior. We thus demonstrate that Ca1.8Sr0.2RuO4 is a hybrid metal with an orbitally-selective Fermi liquid quasiparticle breakdown.Correlated metals are typically classified either as Fermi liquids or non-Fermi liquids depending on whether resistivity scales with temperature squared or not. There is, however, transport evidence suggesting that some materials are hybrids of these two metal classes [1]. This mixed regime is of particular interest as it provides insight into how Fermi liquids break down and the nature of non-Fermi liquid quasiparticles. In this context, multi-orbital metallic systems in conjunction with strong Hund's coupling and electron correlations are of great conceptual importance [2]. Such Hund's metals are expected to display orbital differentiated quasiparticle (QP) renormalization effects along with magnetic correlations [3]. In the strongly correlated limit, orbitally selective Mott physics (OSMP) has been explored theoretically [4][5][6][7][8][9]. The concepts of Hund's metals and OSMP have both been applied to describe band structure renormalization effects in pnictide superconductor compounds [10][11][12][13][14][15]. It remains, however, unclear whether these systems exhibit genuine heavy Fermion and Mott physics. In contrast, the oxide compounds LiV 2 O 4 and Ca 1.8 Sr 0.2 RuO 4 are multi-orbital systems where the existence of heavy Fermions are clearly demonstrated from specific heat measurements [16,17]. Ca 1.8 Sr 0.2 RuO 4 is furthermore in close proximity to a Mott-Hubbard metalinsulator transition [18]. Angle resolved-photoemission experiments (ARPES) on this system have been interpreted in terms of both the Hund's metal and the OSMP scenario [19,20]. Resistivity and specific heat indicate that the ground state is a Fermi liquid (FL). How-ever, a thermal excitation of just 1 K turns the system into a non-Fermi liquid (nFL) state [16]. Here we present a high-resolution ARPES study, demonstrating that Ca 1.8 Sr 0.2 RuO 4 is neither a standard Hunds metal nor representing OSMP. In fact, the thermally excited state constitutes an example of a hybrid metal. Along the Ru-O bond direction, bands with d xz , d yz orbital character display FL behavior whereas d xy dominated bands host nFL QPs. Breakdown of FL QPs are therefore orbitally selective. This physics might apply to other ruthenate systems such as for example Sr 3 Ru 2 O 7 .Single crystals of Ca 1.8 Sr 0.2 RuO 4 were grown by the flux-feeding floating-zone technique [30,31]. ARPES experiments were carried o...

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confidence: 55%

Orbitally selective breakdown of Fermi liquid quasiparticles in Ca1.8Sr0.2RuO4

et al. 2019

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“…As shown in Fig. 2(f), ω c ∼ 0.4 eV (ω 2 c ∼ 0.16 eV 2 ) in PLCCO is twice as large as that of the nodal region in overdoped LSCO [17,55] (see the Appendix for determination of ω c ). However, in LSCO the self-energy is not isotropic and for both LSCO and PLCCO, Im ∝ ω for ω > ω c (see the Appendix).…”

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confidence: 85%

Oxide Fermi liquid universality revealed by electron spectroscopy

Horio¹,

Kramer²,

Wang³

et al. 2020

Phys. Rev. B

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We present a combined soft x-ray and high-resolution vacuum-ultraviolet angle-resolved photoemission spectroscopy study of the electron-overdoped cuprate Pr 1.3−x La 0.7 Ce x CuO 4 (PLCCO). Demonstration of its highly two-dimensional band structure enabled precise determination of the in-plane self-energy dominated by electron-electron scattering. Through analysis of this self-energy and the Fermi liquid cut-off energy scale, we find-in contrast to hole-doped cuprates-a momentum isotropic and comparatively weak electron correlation in PLCCO. Yet, the self-energies extracted from multiple oxide systems combine to demonstrate a logarithmic divergent relation between the quasiparticle scattering rate and mass. This constitutes a spectroscopic version of the Kadowaki-Woods relation with an important merit-the demonstration of Fermi liquid quasiparticle lifetime and mass being set by a single energy scale.

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“…Crystal lattice parameters a and c are listed in Table I. The sample quality has been demonstrated previously by experiments [31][32][33][34][35] on the same batch of crystals. Experiments were carried out at the SX-ARPES endstation [36] of the ADRESS beamline [37] at the Swiss Light Source (SLS) of the Paul Scherrer Institute (PSI), Switzerland.…”

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Three-Dimensional Fermi Surface of Overdoped La-Based Cuprates

Horio¹,

Hauser²,

Sassa³

et al. 2018

Phys. Rev. Lett.

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We present a soft x-ray angle-resolved photoemission spectroscopy study of overdoped high-temperature superconductors. In-plane and out-of-plane components of the Fermi surface are mapped by varying the photoemission angle and the incident photon energy. No k_{z} dispersion is observed along the nodal direction, whereas a significant antinodal k_{z} dispersion is identified for La-based cuprates. Based on a tight-binding parametrization, we discuss the implications for the density of states near the van Hove singularity. Our results suggest that the large electronic specific heat found in overdoped La_{2-x}Sr_{x}CuO_{4} cannot be assigned to the van Hove singularity alone. We therefore propose quantum criticality induced by a collapsing pseudogap phase as a plausible explanation for observed enhancement of electronic specific heat.

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Nodal Landau Fermi-liquid quasiparticles in overdoped La1.77Sr0.23CuO4

Cited by 14 publications

References 36 publications

Orbitally selective breakdown of Fermi liquid quasiparticles in Ca1.8Sr0.2RuO4

Orbitally selective breakdown of Fermi liquid quasiparticles in Ca1.8Sr0.2RuO4

Oxide Fermi liquid universality revealed by electron spectroscopy

Three-Dimensional Fermi Surface of Overdoped La-Based Cuprates

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