Persistent spin excitations in doped antiferromagnets revealed by resonant inelastic light scattering

Jia, Chunjing; Nowadnick, Elizabeth; Wohlfeld, Krzysztof; Kung, Y. F.; Chen, Cheng-Chien; Johnston, S.; Tohyama, Takami; Moritz, Brian; Devereaux, T. P.

doi:10.1038/ncomms4314

Cited by 148 publications

(184 citation statements)

References 38 publications

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“…11 This asymmetry between doping types is also well caught within the single-band Hubbard model, as proved by the good agreement between S(q, ω) calculations and experimental results. 19 Our data also confirm the existence of a fast dispersive charge mode present in all e-doped materials but absent in h-doped samples. Our assignment of this mode to charge excitations is supported by the polarization dependence of Cu−L 3 RIXS data and also Cu−K RIXS measurements on e-doped crystals 11,45 .…”

Section: Discussionsupporting

confidence: 81%

“…Experiments show that also the paramagnon excitations have a different doping evolution upon hole and electron doping: for h-doped compounds the dispersion is almost unaffected by doping, while for e-doped ones the dispersion is doping dependent, with hardening of the paramagnon mode up to 50% 11,12 . This asymmetry can be correctly captured by a relatively simple model including three-site exchange 19 , even though there is no perfect agreement with the experimental dispersion data 11,12 .…”

Section: Introductionmentioning

confidence: 89%

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Spin and charge excitations in artificial hole- and electron-doped infinite layer cuprate superconductors

et al. 2017

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The asymmetry between electron-and hole-doping in high critical-temperature superconducting (HTS) cuprates is key information for the understanding of Cooper pairs formation mechanisms.Despite intensive studies on different cuprates, a comprehensive description of related magnetic and charge excitations is still fragmentary. In the present work, artificial cuprates were used to cover the entire phase diagram within the same HTS family. In particular, Cu L 3 -edge resonant inelastic x-ray scattering (RIXS) measurements were performed on artificial n-and p-type infinite layers (IL) epitaxial films. Beside several similarities, RIXS spectra show noticeable differences in the evolution, with doping level, of magnetic and charge intensity and damping. Compatible trends can be found in spectra measured on bulk cuprates, as well as in theoretical calculations of the spin dynamical structure factor S(q, ω). The findings give a deeper insight about the evolution of collective excitations across the cuprate phase diagram, and on underlying general features, only connected to the doping type. Moreover they pave the way to the exploration of general properties of HTS physics over a broad range of conditions, by means of artificial compounds not constrained by the thermodynamic limitations governing the chemical stability of bulk materials.

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Section: Discussionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 89%

Spin and charge excitations in artificial hole- and electron-doped infinite layer cuprate superconductors

et al. 2017

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“…These two approaches can be seen as approximations of the Hubbard model, which probably contains the relevant physics, including superconductivity 10 , and could form the basis of a comprehensive theory that bridges the gap between these two limits. Indeed, numerical calculations on clusters of finite size have shown to be consistent with experimentally measured electronic and magnetic excitation spectra 11,12 . However, a generally valid solution to the Hubbard model remains out of reach.…”

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confidence: 54%

Anisotropic softening of magnetic excitations along the nodal direction in superconducting cuprates

et al. 2014

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The high-T c cuprate superconductors are close to antiferromagnetic order. Recent measurements of magnetic excitations have reported an intriguing similarity to the spin wavesmagnons-of the antiferromagnetic insulating parent compounds, suggesting that magnons may survive in damped, broadened form throughout the phase diagram. Here we show by resonant inelastic X-ray scattering on Bi 2 Sr 2 CaCu 2 O 8 þ d (Bi-2212) that the analogy with spin waves is only partial. The magnon-like features collapse along the nodal direction in momentum space and exhibit a photon energy dependence markedly different from the Mott-insulating case. These observations can be naturally described by the continuum of charge and spin excitations of correlated electrons. The persistence of damped magnons could favour scenarios for superconductivity built from quasiparticles coupled to spin fluctuations. However, excitation spectra composed of particle-hole excitations suggest that superconductivity emerges from a coherent treatment of electronic spin and charge in the form of quasiparticles with very strong magnetic correlations.

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“…This effective Heisenberg model is in principle not applicable to doped and hence antiferromagnetically disordered cuprates. For an exact description of the data, more sophisticated numerical methods have been developed [35]. However, in the absence of analytical models, the Heisenberg model serves as a useful effective parametrization tool to describe the damped spin excitations.…”

Section: Discussionmentioning

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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Persistent spin excitations in doped antiferromagnets revealed by resonant inelastic light scattering

Cited by 148 publications

References 38 publications

Spin and charge excitations in artificial hole- and electron-doped infinite layer cuprate superconductors

Spin and charge excitations in artificial hole- and electron-doped infinite layer cuprate superconductors

Anisotropic softening of magnetic excitations along the nodal direction in superconducting cuprates

Damped spin excitations in a doped cuprate superconductor with orbital hybridization

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