Strongly Correlated Charge Density Wave in 
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Lin, Jun-Fa; Miao, Hu; Mazzone, D. G.; Gu, Genda; Nag, Abhishek; Walters, A. C.; García-Fernández, Mirian; Barbour, Andi; Pelliciari, J.; Jarrige, Ignace; Oda, Masahiro; Kurosawa, Kou; Momono, N.; Zhou, Kejin; Bisogni, Valentina; Liu, X.; Dean, M. P. M.

doi:10.1103/physrevlett.124.207005

Cited by 49 publications

(46 citation statements)

References 45 publications

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“…Rather, it is crucial for theoretical models to take into account the velocity values for the description of the CDWs in cuprates. Lin et al recently reported little signature of dispersive CDW excitations in LSCO compounds despite the phonon-softening across a wide doping range (19). The bond-stretching phonon intensities, with and without the presence of CDW correlation, show similar momentum dependence, in contrast to our Bi2201 RIXS data (Fig.…”

Section: Significancesupporting

confidence: 68%

“…S8). Although the softening wavevector is close to Q CDW in Bi2201 and Bi2212, a recent RIXS study of CDW correlations in LSCO shows that the phonon softening develops at Q > Q CDW , possibly implying a delicate relationship between the momentum of the phonon softening and the CDW wavevectors (19). In Fig.…”

Section: Significancementioning

confidence: 76%

“…Further experiments aimed at uncovering dynamical CDW excitations in different cuprates may help elucidate the relevance of CDWs for the anomalous normal state and the unconventional superconducting properties. Concerning the underlying mechanism of CDWs, the most recent CDW studies on YBCO and LSCO add mounting evidence that the Fermi-surface nesting alone is unlikely to be the primary driving force (12,19). Moreover, the fact that the CDW dynamics interfere with the phonons points toward an important role of the EPC in the formation of the CDWs (33)(34)(35)(36).…”

Section: Significancementioning

confidence: 99%

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Multiorbital charge-density wave excitations and concomitant phonon anomalies in Bi ₂ Sr ₂ LaCuO _6+δ

Nag

Pelliciari

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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Charge-density waves (CDWs) are ubiquitous in underdoped cuprate superconductors. As a modulation of the valence electron density, CDWs in hole-doped cuprates possess both Cu-3dand O-2porbital character owing to the strong hybridization of these orbitals near the Fermi level. Here, we investigate underdoped Bi2Sr1.4La0.6CuO6+δusing resonant inelastic X-ray scattering (RIXS) and find that a short-range CDW exists at both Cu and O sublattices in the copper-oxide (CuO2) planes with a comparable periodicity and correlation length. Furthermore, we uncover bond-stretching and bond-buckling phonon anomalies concomitant to the CDWs. Comparing to slightly overdoped Bi2Sr1.8La0.2CuO6+δ, where neither CDWs nor phonon anomalies appear, we highlight that a sharp intensity anomaly is induced in the proximity of the CDW wavevector (QCDW) for the bond-buckling phonon, in concert with the diffused intensity enhancement of the bond-stretching phonon at wavevectors much greater than QCDW. Our results provide a comprehensive picture of the quasistatic CDWs, their dispersive excitations, and associated electron-phonon anomalies, which are key for understanding the competing electronic instabilities in cuprates.

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Section: Significancesupporting

confidence: 68%

Section: Significancementioning

confidence: 76%

Section: Significancementioning

confidence: 99%

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Multiorbital charge-density wave excitations and concomitant phonon anomalies in Bi ₂ Sr ₂ LaCuO _6+δ

Nag

Pelliciari

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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“…In the 70-90 meV energy range, a weakly dispersive, damped feature is observed. Based on the energy of the feature, this could either be magnetic or the bond-stretching phonon common to complex oxides [52][53][54][55][56]. It is known, however, that the intensity of the bond-stretching phonon increases like jQj 2 , inconsistent with what we find [55,56] (see Fig.…”

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confidence: 87%

Strong Superexchange in a d9−δ Nickelate Revealed by Resonant Inelastic X-Ray Scattering

et al. 2021

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The discovery of superconductivity in a d 9−δ nickelate has inspired disparate theoretical perspectives regarding the essential physics of this class of materials. A key issue is the magnitude of the magnetic superexchange, which relates to whether cuprate-like high-temperature nickelate superconductivity could be realized. We address this question using Ni L-edge and O K-edge spectroscopy of the reduced d 9−1=3 trilayer nickelates R 4 Ni 3 O 8 (where R ¼ La, Pr) and associated theoretical modeling. A magnon energy scale of ∼80 meV resulting from a nearest-neighbor magnetic exchange of J ¼ 69ð4Þ meV is observed, proving that d 9−δ nickelates can host a large superexchange. This value, along with that of the Ni-O hybridization estimated from our O K-edge data, implies that trilayer nickelates represent an intermediate case between the infinite-layer nickelates and the cuprates. Layered nickelates thus provide a route to testing the relevance of superexchange to nickelate superconductivity.

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“…Over the last few years, RIXS measurements have revealed dynamic correlations associated with CO in various cuprate families 22,[34][35][36][37][38] . However, while their detailed relationship to this work remains an open question to be resolved by future φ-dependent RIXS measurements, a comparison among them reveals deep connections.…”

Section: Discussionmentioning

confidence: 99%

Dynamic electron correlations with charge order wavelength along all directions in the copper oxide plane

et al. 2021

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In strongly correlated systems the strength of Coulomb interactions between electrons, relative to their kinetic energy, plays a central role in determining their emergent quantum mechanical phases. We perform resonant x-ray scattering on Bi2Sr2CaCu2O8+δ, a prototypical cuprate superconductor, to probe electronic correlations within the CuO2 plane. We discover a dynamic quasi-circular pattern in the x-y scattering plane with a radius that matches the wave vector magnitude of the well-known static charge order. Along with doping- and temperature-dependent measurements, our experiments reveal a picture of charge order competing with superconductivity where short-range domains along x and y can dynamically rotate into any other in-plane direction. This quasi-circular spectrum, a hallmark of Brazovskii-type fluctuations, has immediate consequences to our understanding of rotational and translational symmetry breaking in the cuprates. We discuss how the combination of short- and long-range Coulomb interactions results in an effective non-monotonic potential that may determine the quasi-circular pattern.

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Strongly Correlated Charge Density Wave in La2−xSrxCuO4

Cited by 49 publications

References 45 publications

Multiorbital charge-density wave excitations and concomitant phonon anomalies in Bi ₂ Sr ₂ LaCuO _6+δ

Multiorbital charge-density wave excitations and concomitant phonon anomalies in Bi ₂ Sr ₂ LaCuO _6+δ

Strong Superexchange in a d9−δ Nickelate Revealed by Resonant Inelastic X-Ray Scattering

Dynamic electron correlations with charge order wavelength along all directions in the copper oxide plane

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Strongly Correlated Charge Density Wave in La2−xSrxCuO4

Cited by 49 publications

References 45 publications

Multiorbital charge-density wave excitations and concomitant phonon anomalies in Bi 2 Sr 2 LaCuO 6+δ

Multiorbital charge-density wave excitations and concomitant phonon anomalies in Bi 2 Sr 2 LaCuO 6+δ

Strong Superexchange in a d9−δ Nickelate Revealed by Resonant Inelastic X-Ray Scattering

Dynamic electron correlations with charge order wavelength along all directions in the copper oxide plane

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Product

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Multiorbital charge-density wave excitations and concomitant phonon anomalies in Bi ₂ Sr ₂ LaCuO _6+δ

Multiorbital charge-density wave excitations and concomitant phonon anomalies in Bi ₂ Sr ₂ LaCuO _6+δ