Two-Orbital Model Explains the Higher Transition Temperature of the Single-Layer Hg-Cuprate Superconductor Compared to That of the La-Cuprate Superconductor

Sakakibara, Hirofumi; Usui, Hidetomo; Kuroki, Kazuhiko; Arita, Ryotaro; Aoki, Hideo

doi:10.1103/physrevlett.105.057003

Cited by 181 publications

(243 citation statements)

References 26 publications

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“…Exact numerical determination of E z 2 is still a matter of debate [14,33]. For a tetragonal system, E z 2 generally depends on the ratio between copper to apical and planar oxygen distances [34].…”

Section: Discussionmentioning

confidence: 99%

“…3) motivates a two-band model. It has been demonstrated that d z 2 states contribute to effectively increase the t hopping parameter [14]. Keeping Z = 1.219 as in La 2 CuO 4 [8] and t = −t /2, a satisfactory description (solid line in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…This provides a satisfactory description of the zone-boundary dispersion. We thus conclude that the two-orbital model [14] is necessary to understand the spin-excitation spectrum of doped LSCO.…”

Section: Introductionmentioning

confidence: 86%

“…Empirically [11], the superconducting transition scales with the ratio t /t whereas Hubbard-type models predict the opposite trend [12,13]. As a resolution, a two-orbital model-in which hybridization of d z 2 and d x 2 −y 2 states suppresses T c and enhances t -has been put forward [14].…”

Section: Introductionmentioning

confidence: 99%

“…The Hubbard model is thus within a single-band picture not consistent with the experiment. However, using a two-orbital model, hybridization between d z 2 and d x 2 −y 2 states enhances t [14]. This provides a satisfactory description of the zone-boundary dispersion.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Damped spin excitations in a doped cuprate superconductor with orbital hybridization

Ivashko

Shaik

et al. 2017

Phys. Rev. B

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A 3D Tight‐Binding Model for La‐Based Cuprate Superconductors

Photopoulos

Frésard

2019

Annalen der Physik

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Motivated by the recent experimental determination of the three-dimensional Fermi surface of overdoped Labased cuprate superconductors [Horio et al., Phys. Rev. Lett. 2018, 121, 077004], we revisit the tight-binding parameterization of their conduction band. We construct a minimal tight-binding model entailing eight orbitals, two of them involving apical oxygen ions. Parameter optimization allows to almost perfectly reproduce the three-dimensional conduction band as obtained from density functional theory (DFT). We discuss how each parameter entering this multiband model influences it, and show that the peculiar form of its dispersion severely constraints the parameter values. We then evidence that standard perturbative derivation of an effective one-band model is poorly converging because of the comparatively small value of the charge transfer gap. Yet, this allows us to unravel the microscopical origin of the in-plane and out-of-plane hopping amplitudes. An alternative approach to the computation of the tight-binding parameters of the effective model is presented and worked out. It results that the agreement with DFT is preserved provided longer-ranged hopping amplitudes are retained. A comparison with existing models is also performed. Finally, the Fermi surface, showing staggered pieces alternating in size and shape, is compared to experiment, with the density of states also being calculated.

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Effect of external pressure on the normal and superconducting properties of high‐ cuprates

Сидоров

Гавричков

Николаев

et al. 2015

Physica Status Solidi (b)

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The pressure effects on the normal state electronic structure, the superexchange interaction, and the critical temperature of d-type superconductivity mediated by magnetic pairing have been studied within the multielectron hybrid scheme LDA+GTB that takes into account electron correlations in CuO 2 planes. We have found the changes of the multiband p-d model parameters at 3% compression of different symmetry: a) hydrostatic, b) along the c-axis, c) in a-b plane. We have studied the changes of the Fermi surface under external pressure for different hole doping concentration x. In general this effect is too small except two critical concentrations x c1 ≈ 0.15 and x c2 = 0.24 where the Lifshitz transitions occur with the change of the Fermi surface topology. In the vicinity of the critical concentration we have found the giant change of the Fermi surface area up to 100% related to the pressure induced Lifshitz transition. The effects of pressure on the antiferromagnetic coupling J and the mean-field value of T c are obtained in a good agreement to experimental data.

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Two-Orbital Model Explains the Higher Transition Temperature of the Single-Layer Hg-Cuprate Superconductor Compared to That of the La-Cuprate Superconductor

Cited by 181 publications

References 26 publications

Damped spin excitations in a doped cuprate superconductor with orbital hybridization

Damped spin excitations in a doped cuprate superconductor with orbital hybridization

A 3D Tight‐Binding Model for La‐Based Cuprate Superconductors

Effect of external pressure on the normal and superconducting properties of high‐ cuprates

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