Persistent low-energy phonon broadening near the charge-order 
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 vector in the bilayer cuprate 
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He, Yang; Wu, S.-B.; Song, Yunya; Lee, W. S.; Said, Ayman; Alataş, Ahmet; Bosak, A.; Girard, Adrien; Souliou, S. M.; Ruiz, Alejandro; Hepting, Matthias; Bluschke, Martin; Schierle, E.; Weschke, E.; Lee, J. S.; Jang, Hoyoung; Huang, Huei Li; Hashimoto, M.; Lu, D. H.; Song, Dongjoon; Yoshida, Yoshiyuki; Eisaki, H.; Shen, Zhi‐Xun; Birgeneau, R. J.; Yi, Ming; Frañó, Alex

doi:10.1103/physrevb.98.035102

Cited by 34 publications

(29 citation statements)

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“…This line of thinking is consistent with the enhancement of the CDW in monolayer VSe 2 , T CDW = 220 K 28 , since the out-of-plane van der Waals interactions are absent in this case. The critical role of out-of-plane coupling of layers has also been highlighted in the development of the 3D CDW in high-Tc cuprate superconductors [39][40][41] .…”

Section: Discussionmentioning

confidence: 99%

van der Waals driven anharmonic melting of the 3D charge density wave in VSe2

et al. 2021

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Understanding of charge-density wave (CDW) phases is a main challenge in condensed matter due to their presence in high-Tc superconductors or transition metal dichalcogenides (TMDs). Among TMDs, the origin of the CDW in VSe2 remains highly debated. Here, by means of inelastic x-ray scattering and first-principles calculations, we show that the CDW transition is driven by the collapse at 110 K of an acoustic mode at qCDW = (2.25 0 0.7) r.l.u. The softening starts below 225 K and expands over a wide region of the Brillouin zone, identifying the electron-phonon interaction as the driving force of the CDW. This is supported by our calculations that determine a large momentum-dependence of the electron-phonon matrix-elements that peak at the CDW wave vector. Our first-principles anharmonic calculations reproduce the temperature dependence of the soft mode and the TCDW onset only when considering the out-of-plane van der Waals interactions, which reveal crucial for the melting of the CDW phase.

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Section: Discussionmentioning

confidence: 99%

van der Waals driven anharmonic melting of the 3D charge density wave in VSe2

et al. 2021

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“…1). Even if a substantial amount of the excess charge goes onto the chain Cu, HPO compounds still differ significantly from the phase diagram as it applies to conventionally "overdoped" materials (23,24), in that T c shows no indication of rolling over up to the highest p values. X-ray measurements (25) and valence-bond sum calculations (26) that concur with the optimum p value for O 2 -doped cuprates do, however, confirm that p does exceed 0.3 for HPO YSCO-Mo and related (Cu-Mo)-12s2 superconductors.…”

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confidence: 97%

Local lattice distortions and dynamics in extremely overdoped superconducting YSr ₂ Cu _2.75 Mo _0.25 O _7.54

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Geballe

Gauzzi

et al. 2020

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

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A common characteristic of many “overdoped” cuprates prepared with high-pressure oxygen isTcvalues ≥ 50 K that often exceed that of optimally doped parent compounds, despite O stoichiometries that place the materials at the edge or outside of the conventional boundary between superconducting and normal Fermi liquid states. X-ray absorption fine-structure (XAFS) measurements at 52 K on samples of high-pressure oxygen (HPO) YSr2Cu2.75Mo0.25O7.54,Tc= 84 K show that the Mo is in the (VI) valence in an unusually undistorted octahedral geometry with predominantly Mo neighbors that is consistent with its assigned substitution for Cu in the chain sites of the structure. Perturbations of the Cu environments are minimal, although the Cu X-ray absorption near-edge structure (XANES) differs from that in other cuprates. The primary deviation from the crystal structure is therefore nanophase separation into Mo- and Cu-enriched domains. There are, however, indications that the dynamical attributes of the structure are altered relative to YBa2Cu3O7, including a shift of the Cu-apical O two-site distribution from the chain to the plane Cu sites. Another effect that would influenceTcis the possibility of multiple bands at the Fermi surface caused by the presence of the second phase and the lowering of the Fermi level.

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“…Experimentally, however, anomalous isotope effects (5), resonant ultrasound (6), angle-resolved photoemission spectroscopy (7)(8)(9), femtosecond optical pump terahertz (10)/megaelectron-volt transmission electron microscopy probe (11), infrared pump (12), and so on have demonstrated that specific phonons not only couple to the superconductivity but correlate directly with the gap energy and may even transiently induce it well above the superconducting critical temperature, T c . Cuprates also exhibit a plethora of superstructures indicative of strong electron-lattice coupling, stripes that have been proposed to stabilize the superconductivity (13), and charge-density waves (14,15) and the pseudogap (PG) (16) that compete with it. Another possibility is mechanisms that boost T c from a low value expected within a conventional Bardeen-Cooper-Schrieffer (BCS) scheme.…”

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Nonadiabatic coupling of the dynamical structure to the superconductivity in YSr ₂ Cu _2.75 Mo _0.25 O _7.54 and Sr ₂ CuO _3.3

Conradson

Geballe

Jin

et al. 2020

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

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A crucial issue in cuprates is the extent and mechanism of the coupling of the lattice to the electrons and the superconductivity. Here we report Cu K edge extended X-ray absorption fine structure measurements elucidating the internal quantum tunneling polaron (iqtp) component of the dynamical structure in two heavily overdoped superconducting cuprate compounds, tetragonal YSr2Cu2.75Mo0.25O7.54 with superconducting critical temperature, Tc = 84 K and hole density p = 0.3 to 0.5 per planar Cu, and the tetragonal phase of Sr2CuO3.3 with Tc = 95 K and p = 0.6. In YSr2Cu2.75Mo0.25O7.54 changes in the Cu-apical O two-site distribution reflect a sequential renormalization of the double-well potential of this site beginning at Tc, with the energy difference between the two minima increasing by ∼6 meV between Tc and 52 K. Sr2CuO3.3 undergoes a radically larger transformation at Tc, >1-Å displacements of the apical O atoms. The principal feature of the dynamical structure underlying these transformations is the strongly anharmonic oscillation of the apical O atoms in a double-well potential that results in the observation of two distinct O sites whose Cu–O distances indicate different bonding modes and valence-charge distributions. The coupling of the superconductivity to the iqtp that originates in this nonadiabatic coupling between the electrons and lattice demonstrates an important role for the dynamical structure whereby pairing occurs even in a system where displacements of the atoms that are part of the transition are sufficiently large to alter the Fermi surface. The synchronization and dynamic coherence of the iqtps resulting from the strong interactions within a crystal would be expected to influence this process.

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Persistent low-energy phonon broadening near the charge-order q vector in the bilayer cuprate Bi2Sr2CaCu2O8+

Cited by 34 publications

References 50 publications

van der Waals driven anharmonic melting of the 3D charge density wave in VSe2

van der Waals driven anharmonic melting of the 3D charge density wave in VSe2

Local lattice distortions and dynamics in extremely overdoped superconducting YSr ₂ Cu _2.75 Mo _0.25 O _7.54

Nonadiabatic coupling of the dynamical structure to the superconductivity in YSr ₂ Cu _2.75 Mo _0.25 O _7.54 and Sr ₂ CuO _3.3

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Persistent low-energy phonon broadening near the charge-order q vector in the bilayer cuprate Bi2Sr2CaCu2O8+

Cited by 34 publications

References 50 publications

van der Waals driven anharmonic melting of the 3D charge density wave in VSe2

van der Waals driven anharmonic melting of the 3D charge density wave in VSe2

Local lattice distortions and dynamics in extremely overdoped superconducting YSr 2 Cu 2.75 Mo 0.25 O 7.54

Nonadiabatic coupling of the dynamical structure to the superconductivity in YSr 2 Cu 2.75 Mo 0.25 O 7.54 and Sr 2 CuO 3.3

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Local lattice distortions and dynamics in extremely overdoped superconducting YSr ₂ Cu _2.75 Mo _0.25 O _7.54

Nonadiabatic coupling of the dynamical structure to the superconductivity in YSr ₂ Cu _2.75 Mo _0.25 O _7.54 and Sr ₂ CuO _3.3